feat(case): persist source audio for learning detail

mobile-uni/src/pages/user/cases/index.vue

@@ -104,7 +104,11 @@
       <text class="case-content">{{ caseDetail.transcript || '暂无转写内容' }}</text>
       <text class="detail-label">案例摘要</text>
       <text class="case-note">{{ caseDetail.summary || '暂无案例摘要' }}</text>
-      <text class="case-note">当前版本提供转写、摘要和状态详情；视频样片、学习点与主管点评待正式媒体和业务字段接入。</text>
+      <view v-if="caseDetail.mediaUrl" class="case-media-block">
+        <text class="detail-label">原始音频</text>
+        <audio class="case-audio" :src="caseDetail.mediaUrl" controls />
+      </view>
+      <text class="case-note">当前版本已保留原始音频回放；预渲染视频样片、学习点与主管点评待正式媒体和业务字段接入。</text>
     </view>
   </view>
 </template>
@@ -369,6 +373,16 @@ onShow(() => {
   font-weight: 700;
 }
 
+.case-media-block {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.case-audio {
+  width: 100%;
+}
+
 .tag-row {
   display: flex;
   flex-wrap: wrap;

mobile-uni/src/types/api.ts

@@ -386,6 +386,8 @@ export interface CaseDetailResponse {
   owner: string;
   transcript: string;
   summary: string;
+  mediaUrl?: string;
+  mediaOssId?: number;
 }
 
 export interface CaseUploadResponse {
@@ -394,6 +396,8 @@ export interface CaseUploadResponse {
   transcript: string;
   tags: CaseTag[];
   source: string;
+  mediaUrl?: string;
+  mediaOssId?: number;
 }
 
 export interface CaseOrganizeResponse {