diff --git a/mobile-uni/src/pages/user/assistant/index.vue b/mobile-uni/src/pages/user/assistant/index.vue
index 76321df3..174812f9 100644
--- a/mobile-uni/src/pages/user/assistant/index.vue
+++ b/mobile-uni/src/pages/user/assistant/index.vue
@@ -15,7 +15,7 @@
           <text class="domain-name">我的资料</text>
           <text class="domain-desc">个人收藏，仅自己可见</text>
         </button>
-        <button class="domain-option" :class="{ active: enterpriseEnabled }" @click="toggleEnterprise">
+        <button class="domain-option" :class="{ active: enterpriseEnabled }" :disabled="asking" @click="changeScope">
           <text class="domain-name">企业知识</text>
           <text class="domain-desc">企业知识按岗位权限</text>
         </button>
@@ -68,6 +68,7 @@
 import { computed, ref } from 'vue';
 import type { PersonalAskResponse, PersonalCitation } from '@/types/api';
 import { askPersonalAssistant, type KnowledgeScope } from '@/services/personal-assistant';
+import { personalItemRoute } from '@/services/personal-assistant-id';
 
 const scopes = ref<KnowledgeScope[]>(['PERSONAL']);
 const queryText = ref('');
@@ -77,7 +78,12 @@ const message = ref('');
 let requestGeneration = 0;
 const enterpriseEnabled = computed(() => scopes.value.includes('ENTERPRISE'));
 
-const toggleEnterprise = () => {
+const scopeKey = (value: KnowledgeScope[]) => value.join(',');
+const changeScope = () => {
+  if (asking.value) return;
+  requestGeneration += 1;
+  answer.value = undefined;
+  message.value = '';
   scopes.value = enterpriseEnabled.value ? ['PERSONAL'] : ['PERSONAL', 'ENTERPRISE'];
 };
 
@@ -85,22 +91,24 @@ const submitQuestion = async () => {
   const question = queryText.value.trim();
   if (!question || asking.value) return;
   const generation = ++requestGeneration;
+  const scopeSnapshot = [...scopes.value];
   asking.value = true;
   answer.value = undefined;
   message.value = '';
   try {
-    const response = await askPersonalAssistant({ queryText: question, scope: scopes.value, outputFormat: 'ACTION_PLAN' });
-    if (generation !== requestGeneration) return;
+    const response = await askPersonalAssistant({ queryText: question, scope: scopeSnapshot, outputFormat: 'ACTION_PLAN' });
+    if (generation !== requestGeneration || scopeKey(scopes.value) !== scopeKey(scopeSnapshot)) return;
     answer.value = response;
   } catch (error) {
     if (generation !== requestGeneration) return;
     const text = error instanceof Error ? error.message : '提问失败，请稍后重试';
     if (enterpriseEnabled.value && /ENTERPRISE_SCOPE_FORBIDDEN|企业知识|FORBIDDEN/i.test(text)) {
       scopes.value = ['PERSONAL'];
+      const fallbackScope: KnowledgeScope[] = ['PERSONAL'];
       message.value = '当前岗位没有企业知识权限，已仅查询我的资料。';
       try {
-        const personalResponse = await askPersonalAssistant({ queryText: question, scope: ['PERSONAL'], outputFormat: 'ACTION_PLAN' });
-        if (generation !== requestGeneration) return;
+        const personalResponse = await askPersonalAssistant({ queryText: question, scope: fallbackScope, outputFormat: 'ACTION_PLAN' });
+        if (generation !== requestGeneration || scopeKey(scopes.value) !== scopeKey(fallbackScope)) return;
         answer.value = personalResponse;
       } catch (personalError) {
         if (generation !== requestGeneration) return;
@@ -122,7 +130,7 @@ const citationLabel = (citation: PersonalCitation) => {
 
 const openCitation = (citation: PersonalCitation) => {
   if (citation.domain !== 'PERSONAL' || !citation.itemId) return;
-  uni.navigateTo({ url: `/pages/user/assistant/item?id=${citation.itemId}` });
+  uni.navigateTo({ url: personalItemRoute(citation.itemId) });
 };
 
 const goBack = () => uni.navigateBack();
diff --git a/mobile-uni/src/pages/user/assistant/item.vue b/mobile-uni/src/pages/user/assistant/item.vue
index d3bccec6..3fc94928 100644
--- a/mobile-uni/src/pages/user/assistant/item.vue
+++ b/mobile-uni/src/pages/user/assistant/item.vue
@@ -34,8 +34,9 @@ import { ref } from 'vue';
 import { onLoad } from '@dcloudio/uni-app';
 import type { PersonalItem, PersonalItemSourceType, PersonalItemStatus } from '@/types/api';
 import { deletePersonalItem, downloadPersonalItem, loadPersonalItem, retryPersonalItem } from '@/services/personal-assistant';
+import { normalizeBackendId } from '@/services/personal-assistant-id';
 
-const itemId = ref(0); const item = ref<PersonalItem>(); const loading = ref(false); const busy = ref(false); const message = ref('');
+const itemId = ref(''); const item = ref<PersonalItem>(); const loading = ref(false); const busy = ref(false); const message = ref('');
 const statusText = (status: PersonalItemStatus) => ({ QUEUED: '等待处理', PARSING: '解析中', READY: '可检索', FAILED: '解析失败', DELETING: '删除中', DELETED: '已删除' })[status];
 const statusDescription = (status: PersonalItemStatus) => ({ QUEUED: '已进入解析队列。', PARSING: '正在提取正文和建立搜索索引。', READY: '已完成解析，可用于个人助理问答。', FAILED: '本次解析失败，可查看公开原因后重试。', DELETING: '正在清理附件、正文和索引。', DELETED: '资料已删除。' })[status];
 const sourceText = (source: PersonalItemSourceType) => ({ TEXT: '文字', FILE: '文件', URL: '外部网页' })[source];
@@ -45,7 +46,14 @@ const download = async () => { busy.value = true; try { const result = await dow
 const confirmDelete = () => uni.showModal({ title: '确认删除资料', content: '附件、解析正文和搜索索引会清除，删除后无法恢复。', confirmText: '确认删除', confirmColor: '#e70014', success: (result) => { if (result.confirm) void remove(); } });
 const remove = async () => { busy.value = true; message.value = ''; try { await deletePersonalItem(itemId.value); uni.redirectTo({ url: '/pages/user/assistant/library' }); } catch (error) { message.value = error instanceof Error ? error.message : '删除失败，请重试'; } finally { busy.value = false; } };
 const goBack = () => uni.navigateBack();
-onLoad((options) => { itemId.value = Number(options?.id || 0); if (!Number.isSafeInteger(itemId.value) || itemId.value <= 0) message.value = '资料不存在或无权访问'; else void load(); });
+onLoad((options) => {
+  try {
+    itemId.value = normalizeBackendId(String(options?.id || ''));
+    void load();
+  } catch {
+    message.value = '资料不存在或无权访问';
+  }
+});
 </script>
 
 <style scoped>
diff --git a/mobile-uni/src/pages/user/assistant/library.vue b/mobile-uni/src/pages/user/assistant/library.vue
index 3b2f7c72..e14ba1f5 100644
--- a/mobile-uni/src/pages/user/assistant/library.vue
+++ b/mobile-uni/src/pages/user/assistant/library.vue
@@ -41,6 +41,7 @@ import { computed, ref } from 'vue';
 import { onShow } from '@dcloudio/uni-app';
 import type { PersonalItem, PersonalItemSourceType, PersonalItemStatus, PersonalSpace } from '@/types/api';
 import { loadPersonalItems, loadPersonalSpace, mergePersonalRows } from '@/services/personal-assistant';
+import { personalItemRoute } from '@/services/personal-assistant-id';
 
 const pageNum = ref(1);
 const pageSize = 10;
@@ -92,7 +93,7 @@ const changeStatus = (event: { detail: { value: string | number } }) => { status
 const sourceText = (value: PersonalItemSourceType) => ({ TEXT: '文字', FILE: '文件', URL: '外部网页' })[value];
 const statusText = (value: PersonalItemStatus) => ({ QUEUED: '等待处理', PARSING: '解析中', READY: '可检索', FAILED: '解析失败', DELETING: '删除中', DELETED: '已删除' })[value];
 const formatBytes = (bytes: number) => bytes >= 1048576 ? `${(bytes / 1048576).toFixed(1)}MB` : `${Math.ceil(bytes / 1024)}KB`;
-const openItem = (id: number) => uni.navigateTo({ url: `/pages/user/assistant/item?id=${id}` });
+const openItem = (id: string) => uni.navigateTo({ url: personalItemRoute(id) });
 const openCapture = () => uni.navigateTo({ url: '/pages/user/assistant/capture' });
 const goBack = () => uni.navigateBack();
 onShow(refresh);
diff --git a/mobile-uni/src/pages/user/assistant/sessions.vue b/mobile-uni/src/pages/user/assistant/sessions.vue
index 3a978c06..401adfc6 100644
--- a/mobile-uni/src/pages/user/assistant/sessions.vue
+++ b/mobile-uni/src/pages/user/assistant/sessions.vue
@@ -30,18 +30,19 @@ import { ref } from 'vue';
 import { onShow } from '@dcloudio/uni-app';
 import type { PersonalCitation, PersonalSession, PersonalSessionDetail } from '@/types/api';
 import { deletePersonalSession, loadPersonalSession, loadPersonalSessions } from '@/services/personal-assistant';
+import { personalItemRoute } from '@/services/personal-assistant-id';
 
 const sessions = ref<PersonalSession[]>([]); const detail = ref<PersonalSessionDetail>(); const loading = ref(false); const message = ref('');
 const loadList = async () => { loading.value = true; message.value = ''; try { sessions.value = await loadPersonalSessions(); } catch (error) { message.value = error instanceof Error ? error.message : '会话加载失败'; } finally { loading.value = false; } };
-const openSession = async (id: number) => { loading.value = true; message.value = ''; try { detail.value = await loadPersonalSession(id); } catch (error) { message.value = error instanceof Error ? error.message : '会话不存在或无权访问'; } finally { loading.value = false; } };
-const confirmDelete = (id: number) => uni.showModal({ title: '删除会话', content: '只删除本次问答记录，不会删除资料库内容。', confirmColor: '#e70014', success: (result) => { if (result.confirm) void remove(id); } });
-const remove = async (id: number) => { loading.value = true; try { await deletePersonalSession(id); detail.value = undefined; await loadList(); } catch (error) { message.value = error instanceof Error ? error.message : '删除会话失败'; } finally { loading.value = false; } };
+const openSession = async (id: string) => { loading.value = true; message.value = ''; try { detail.value = await loadPersonalSession(id); } catch (error) { message.value = error instanceof Error ? error.message : '会话不存在或无权访问'; } finally { loading.value = false; } };
+const confirmDelete = (id: string) => uni.showModal({ title: '删除会话', content: '只删除本次问答记录，不会删除资料库内容。', confirmColor: '#e70014', success: (result) => { if (result.confirm) void remove(id); } });
+const remove = async (id: string) => { loading.value = true; try { await deletePersonalSession(id); detail.value = undefined; await loadList(); } catch (error) { message.value = error instanceof Error ? error.message : '删除会话失败'; } finally { loading.value = false; } };
 const scopeText = (scope: string) => scope.includes('ENTERPRISE') ? '我的资料 + 企业知识' : '我的资料';
 const citationLabel = (citation: PersonalCitation) => citation.domain === 'ENTERPRISE'
   ? '企业 SOP'
   : citation.sourceType === 'URL' ? '外部网页' : '我的资料';
 const openCitation = (citation: PersonalCitation) => {
-  if (citation.itemId) uni.navigateTo({ url: `/pages/user/assistant/item?id=${citation.itemId}` });
+  if (citation.itemId) uni.navigateTo({ url: personalItemRoute(citation.itemId) });
 };
 const goBack = () => uni.navigateBack();
 onShow(loadList);
diff --git a/mobile-uni/src/services/personal-assistant-id.ts b/mobile-uni/src/services/personal-assistant-id.ts
new file mode 100644
index 00000000..069ae14c
--- /dev/null
+++ b/mobile-uni/src/services/personal-assistant-id.ts
@@ -0,0 +1,14 @@
+export const normalizeBackendId = (value: string) => {
+  const id = value.trim();
+  if (!/^[1-9]\d*$/.test(id)) throw new Error('PERSONAL_ID_INVALID');
+  return id;
+};
+
+export const personalItemApiPath = (id: string, suffix = '') =>
+  `/api/aihr/personal-assistant/items/${encodeURIComponent(normalizeBackendId(id))}${suffix}`;
+
+export const personalSessionApiPath = (id: string) =>
+  `/api/aihr/personal-assistant/sessions/${encodeURIComponent(normalizeBackendId(id))}`;
+
+export const personalItemRoute = (id: string) =>
+  `/pages/user/assistant/item?id=${encodeURIComponent(normalizeBackendId(id))}`;
diff --git a/mobile-uni/src/services/personal-assistant.ts b/mobile-uni/src/services/personal-assistant.ts
index 65530137..83f40730 100644
--- a/mobile-uni/src/services/personal-assistant.ts
+++ b/mobile-uni/src/services/personal-assistant.ts
@@ -10,6 +10,7 @@ import type {
   PersonalSpace
 } from '@/types/api';
 import { apiRequest, apiUrl, authHeaders, readTextPayload } from './api';
+import { personalItemApiPath, personalSessionApiPath } from './personal-assistant-id';
 
 export type KnowledgeScope = PersonalKnowledgeScope;
 
@@ -31,12 +32,12 @@ const queryString = (query: PersonalItemQuery) => {
 };
 
 export const askPersonalAssistant = (payload: {
-  sessionId?: number;
+  sessionId?: string;
   queryText: string;
   scope: KnowledgeScope[];
   dateFrom?: string;
   dateTo?: string;
-  itemIds?: number[];
+  itemIds?: string[];
   outputFormat?: 'ANSWER' | 'ACTION_PLAN' | 'OUTLINE';
 }) => apiRequest<PersonalAskResponse>({
   url: '/api/aihr/personal-assistant/ask',
@@ -46,7 +47,7 @@ export const askPersonalAssistant = (payload: {
 });
 
 export const mergePersonalRows = (current: PersonalItem[], incoming: PersonalItem[]) => {
-  const rows = new Map<number, PersonalItem>();
+  const rows = new Map<string, PersonalItem>();
   [...current, ...incoming].forEach((item) => rows.set(item.id, item));
   return Array.from(rows.values());
 };
@@ -61,8 +62,8 @@ export const loadPersonalItems = (query: PersonalItemQuery = {}) => apiRequest<P
   method: 'GET'
 });
 
-export const loadPersonalItem = (id: number) => apiRequest<PersonalItem>({
-  url: `/api/aihr/personal-assistant/items/${id}`,
+export const loadPersonalItem = (id: string) => apiRequest<PersonalItem>({
+  url: personalItemApiPath(id),
   method: 'GET'
 });
 
@@ -128,19 +129,19 @@ export const uploadPersonalFile = (file: PersonalSelectedFile, title?: string, c
     });
   });
 
-export const retryPersonalItem = (id: number) => apiRequest<PersonalItem>({
-  url: `/api/aihr/personal-assistant/items/${id}/retry`,
+export const retryPersonalItem = (id: string) => apiRequest<PersonalItem>({
+  url: personalItemApiPath(id, '/retry'),
   method: 'POST'
 });
 
-export const deletePersonalItem = (id: number) => apiRequest<{ cleanupJobId: number }>({
-  url: `/api/aihr/personal-assistant/items/${id}`,
+export const deletePersonalItem = (id: string) => apiRequest<{ cleanupJobId: string }>({
+  url: personalItemApiPath(id),
   method: 'DELETE',
   timeout: 15000
 });
 
-export const downloadPersonalItem = (id: number) => apiRequest<{ url: string; expiresAt?: string }>({
-  url: `/api/aihr/personal-assistant/items/${id}/download-url`,
+export const downloadPersonalItem = (id: string) => apiRequest<{ url: string; expiresAt?: string }>({
+  url: personalItemApiPath(id, '/download-url'),
   method: 'GET'
 });
 
@@ -149,12 +150,12 @@ export const loadPersonalSessions = () => apiRequest<PersonalSession[]>({
   method: 'GET'
 });
 
-export const loadPersonalSession = (id: number) => apiRequest<PersonalSessionDetail>({
-  url: `/api/aihr/personal-assistant/sessions/${id}`,
+export const loadPersonalSession = (id: string) => apiRequest<PersonalSessionDetail>({
+  url: personalSessionApiPath(id),
   method: 'GET'
 });
 
-export const deletePersonalSession = (id: number) => apiRequest<void>({
-  url: `/api/aihr/personal-assistant/sessions/${id}`,
+export const deletePersonalSession = (id: string) => apiRequest<void>({
+  url: personalSessionApiPath(id),
   method: 'DELETE'
 });
diff --git a/mobile-uni/src/types/api.ts b/mobile-uni/src/types/api.ts
index b4133d6c..c82a716e 100644
--- a/mobile-uni/src/types/api.ts
+++ b/mobile-uni/src/types/api.ts
@@ -123,8 +123,8 @@ export type PersonalItemStatus = 'QUEUED' | 'PARSING' | 'READY' | 'FAILED' | 'DE
 export interface PersonalCitation {
   domain: PersonalKnowledgeScope;
   sourceId: string;
-  itemId?: number;
-  fragmentId?: number;
+  itemId?: string;
+  fragmentId?: string;
   sourceType?: PersonalItemSourceType | 'ENTERPRISE';
   title: string;
   excerpt: string;
@@ -132,7 +132,7 @@ export interface PersonalCitation {
 }
 
 export interface PersonalAskResponse {
-  sessionId: number;
+  sessionId: string;
   answer: string;
   citations: PersonalCitation[];
   model?: string;
@@ -140,7 +140,7 @@ export interface PersonalAskResponse {
 }
 
 export interface PersonalSpace {
-  spaceId: number;
+  spaceId: string;
   status: string;
   quotaBytes: number;
   usedBytes: number;
@@ -148,7 +148,7 @@ export interface PersonalSpace {
 }
 
 export interface PersonalItem {
-  id: number;
+  id: string;
   sourceType: PersonalItemSourceType;
   title: string;
   originalUrl?: string;
@@ -171,20 +171,20 @@ export interface PersonalPage<T> {
 }
 
 export interface PersonalItemCreated {
-  itemId: number;
+  itemId: string;
   status: PersonalItemStatus;
-  duplicateOf?: number;
+  duplicateOf?: string;
 }
 
 export interface PersonalSession {
-  id: number;
+  id: string;
   title: string;
   defaultScope: string;
   updatedAt?: string;
 }
 
 export interface PersonalChatMessage {
-  id: number;
+  id: string;
   role: string;
   content: string;
   citations: PersonalCitation[];
@@ -192,7 +192,7 @@ export interface PersonalChatMessage {
 }
 
 export interface PersonalSessionDetail {
-  id: number;
+  id: string;
   title: string;
   messages: PersonalChatMessage[];
 }
diff --git a/mobile-uni/tests/personal-assistant.test.mjs b/mobile-uni/tests/personal-assistant.test.mjs
index 91a226cc..6c85f28b 100644
--- a/mobile-uni/tests/personal-assistant.test.mjs
+++ b/mobile-uni/tests/personal-assistant.test.mjs
@@ -3,6 +3,15 @@ import { readFile } from 'node:fs/promises';
 import test from 'node:test';
 
 const source = (path) => readFile(new URL(path, import.meta.url), 'utf8');
+const idHelpers = await import('../src/services/personal-assistant-id.ts');
+
+test('Snowflake ID 全程保留字符串精度并安全生成详情路径', () => {
+  const hugeId = '1990000000000000000';
+  assert.equal(idHelpers.normalizeBackendId(hugeId), hugeId);
+  assert.equal(idHelpers.personalItemRoute(hugeId), `/pages/user/assistant/item?id=${hugeId}`);
+  assert.equal(idHelpers.personalItemApiPath(hugeId), `/api/aihr/personal-assistant/items/${hugeId}`);
+  assert.equal(idHelpers.personalSessionApiPath(hugeId), `/api/aihr/personal-assistant/sessions/${hugeId}`);
+});
 
 test('个人助理 API 固定使用登录态且不接收 owner 参数', async () => {
   const [client, api] = await Promise.all([
@@ -13,6 +22,10 @@ test('个人助理 API 固定使用登录态且不接收 owner 参数', async ()
   assert.match(client, /\/api\/aihr\/personal-assistant\/ask/);
   assert.match(client, /\/api\/aihr\/personal-assistant\/items\/file/);
   assert.match(client, /uni\.uploadFile/);
+  assert.match(client, /sessionId\?: string/);
+  assert.match(client, /itemIds\?: string\[\]/);
+  assert.match(client, /loadPersonalItem = \(id: string\)/);
+  assert.match(client, /loadPersonalSession = \(id: string\)/);
   assert.doesNotMatch(client, /ownerUserId|tenantId/);
   assert.doesNotMatch(client, /clearAuthOnUnauthorized:\s*false/);
   assert.doesNotMatch(api, /statusCode === 401 \|\| statusCode === 403/);
@@ -32,6 +45,10 @@ test('问答首页默认只查询个人资料并展示真实引用域', async ()
   assert.doesNotMatch(page, /loadPersonalItem/);
   assert.match(page, /answer\.value = undefined/);
   assert.match(page, /requestGeneration/);
+  assert.match(page, /:disabled="asking"/);
+  assert.match(page, /if \(asking\.value\) return/);
+  assert.match(page, /scopeSnapshot/);
+  assert.match(page, /scopeKey\(scopes\.value\)/);
   assert.match(page, /收藏资料/);
   assert.doesNotMatch(page, /ownerUserId|tenantId/);
 });
@@ -69,6 +86,8 @@ test('个人资料详情包含全部状态、重试、下载和明确删除提
   assert.match(page, /deletePersonalItem/);
   assert.match(page, /downloadPersonalItem/);
   assert.match(page, /附件、解析正文和搜索索引/);
+  assert.match(page, /normalizeBackendId\(String\(options\?\.id/);
+  assert.doesNotMatch(page, /Number\(options\?\.id|parseInt\(options\?\.id|Number\.isSafeInteger/);
 });
 
 test('会话页覆盖列表、详情和删除且不伪造会话', async () => {