feat(observability): add structured application logging

Emit correlated JSON logs from the API and FunASR services, propagate request IDs to the client, and configure bounded opt-in Docker logging.

Document the host-wide Grafana/Loki query workflow and keep observability deployment ownership outside the application repository.

pages/records/index.ts

@@ -1,6 +1,8 @@
 import {
+  copyApiRequestId,
   deleteFeedbackRecord,
   getApiErrorMessage,
+  getApiRequestId,
   listFeedbackRecords,
   listProfiles
 } from '../../utils/api'
@@ -17,7 +19,8 @@ Page({
     selectedProfileIndex: 0,
     loading: false,
     deletingId: '',
-    errorMessage: ''
+    errorMessage: '',
+    errorRequestId: ''
   },
 
   onShow() {
@@ -26,7 +29,7 @@ Page({
   },
 
   async loadData() {
-    this.setData({ loading: true, errorMessage: '' })
+    this.setData({ loading: true, errorMessage: '', errorRequestId: '' })
     try {
       const profiles = await listProfiles()
       const selectedProfile = profiles[this.data.selectedProfileIndex - 1]
@@ -38,7 +41,7 @@ Page({
         records: this.withProfileNames(records, profiles)
       })
     } catch (error) {
-      this.setData({ errorMessage: getApiErrorMessage(error) })
+      this.setData({ errorMessage: getApiErrorMessage(error), errorRequestId: getApiRequestId(error) })
     } finally {
       this.setData({ loading: false })
     }
@@ -55,15 +58,19 @@ Page({
     void this.loadData()
   },
 
+  copyRequestId() {
+    copyApiRequestId(this.data.errorRequestId)
+  },
+
   async onProfileChange(event: PickerEvent) {
     const selectedProfileIndex = Number(event.detail.value)
     const profile = this.data.profiles[selectedProfileIndex - 1]
-    this.setData({ selectedProfileIndex, loading: true, errorMessage: '' })
+    this.setData({ selectedProfileIndex, loading: true, errorMessage: '', errorRequestId: '' })
     try {
       const records = await listFeedbackRecords(profile?.id)
       this.setData({ records: this.withProfileNames(records, this.data.profiles) })
     } catch (error) {
-      this.setData({ errorMessage: getApiErrorMessage(error) })
+      this.setData({ errorMessage: getApiErrorMessage(error), errorRequestId: getApiRequestId(error) })
     } finally {
       this.setData({ loading: false })
     }

pages/records/index.wxml

@@ -6,7 +6,13 @@
   <text class="page-subtitle">按学生查阅已保存的课堂反馈。</text>
 
   <view wx:if="{{errorMessage}}" class="status-banner">
-    <text>{{errorMessage}}</text>
+    <view class="status-copy">
+      <text>{{errorMessage}}</text>
+      <view wx:if="{{errorRequestId}}" class="status-request-id">
+        <text>请求编号：{{errorRequestId}}</text>
+        <text class="status-action" bindtap="copyRequestId">复制</text>
+      </view>
+    </view>
     <text class="status-action" bindtap="retryLoad">重试</text>
   </view>