feat(mobile): render evidence levels and route actions in ask page

- normalize evidenceLevel/uncoveredPoints/nextActions from agent response
- GUIDANCE banner (reference experience, non-formal), PARTIAL uncovered
  points list, ROUTE compact action buttons (human help / direct channel /
  web research); legacy responses render unchanged
- one-tap human help on ROUTE: auto-submit down feedback (NO_ANSWER,
  fragment-less allowed by backend) then existing confirm + idempotent
  publish chain
- direct channel page supports ?channel= preselection

mobile-uni/src/services/agent.ts

@@ -3,7 +3,8 @@ import type {
   KnowledgeConversationState,
   KnowledgeMediaSelectedFile,
   KnowledgeSearchResponse,
-  MemoryCandidate
+  MemoryCandidate,
+  NextAction
 } from '@/types/api';
 import { apiRequest, apiUrl, authHeaders, readTextPayload } from './api';
 
@@ -96,6 +97,10 @@ export const normalizeAgentResponse = (
     detailRef: citation.detailRef,
     locatorSummary: citation.locatorSummary
   }));
+  // 旧版后端 nextActions 是 string[]，无 UI 语义；只透传新契约的对象结构。
+  const nextActions = (Array.isArray(response.nextActions) ? response.nextActions : [])
+    .filter((action): action is NextAction =>
+      Boolean(action) && typeof action === 'object' && typeof action.type === 'string');
   return {
     requestId: response.runId,
     queryText: question,
@@ -119,6 +124,11 @@ export const normalizeAgentResponse = (
     broadcastContext: response.broadcastContext || null,
     agentStatus: response.status,
     agentIntent: response.intent,
+    evidenceLevel: response.evidenceLevel ?? null,
+    uncoveredPoints: Array.isArray(response.uncoveredPoints)
+      ? response.uncoveredPoints.filter((point): point is string => typeof point === 'string' && Boolean(point.trim()))
+      : [],
+    nextActions,
     sourceSummary: response.sourceSummary || [],
     clarification: response.clarification || null,
     keyPoints: response.keyPoints || [],