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/profile/index.ts

@@ -1,7 +1,9 @@
 import {
+  copyApiRequestId,
   ensureAuthentication,
   getApiBaseUrl,
   getApiErrorMessage,
+  getApiRequestId,
   getHealth,
   setApiBaseUrl
 } from '../../utils/api'
@@ -13,10 +15,12 @@ Page({
     apiBaseUrl: getApiBaseUrl(),
     connectionText: '尚未检测',
     connectionTone: 'idle',
+    connectionRequestId: '',
     testing: false,
     authText: '尚未登录',
     authTone: 'idle',
-    authUserId: ''
+    authUserId: '',
+    authRequestId: ''
   },
 
   onShow() {
@@ -37,12 +41,21 @@ Page({
       await this.checkConnection()
       await this.checkAuthentication()
     } catch (error) {
-      this.setData({ connectionText: getApiErrorMessage(error), connectionTone: 'error' })
+      this.setData({
+        connectionText: getApiErrorMessage(error),
+        connectionTone: 'error',
+        connectionRequestId: getApiRequestId(error)
+      })
     }
   },
 
   async checkConnection() {
-    this.setData({ testing: true, connectionText: '正在检测服务...', connectionTone: 'idle' })
+    this.setData({
+      testing: true,
+      connectionText: '正在检测服务...',
+      connectionTone: 'idle',
+      connectionRequestId: ''
+    })
     try {
       const health = await getHealth()
       let connectionText = '服务、数据库和语音转录正常'
@@ -62,30 +75,42 @@ Page({
       }
       this.setData({
         connectionText,
-        connectionTone
+        connectionTone,
+        connectionRequestId: ''
       })
     } catch (error) {
-      this.setData({ connectionText: getApiErrorMessage(error), connectionTone: 'error' })
+      this.setData({
+        connectionText: getApiErrorMessage(error),
+        connectionTone: 'error',
+        connectionRequestId: getApiRequestId(error)
+      })
     } finally {
       this.setData({ testing: false })
     }
   },
 
   async checkAuthentication() {
-    this.setData({ authText: '正在登录...', authTone: 'idle', authUserId: '' })
+    this.setData({ authText: '正在登录...', authTone: 'idle', authUserId: '', authRequestId: '' })
     try {
       const session = await ensureAuthentication()
       this.setData({
         authText: '微信身份已登录',
         authTone: 'success',
-        authUserId: session.userId
+        authUserId: session.userId,
+        authRequestId: ''
       })
     } catch (error) {
       this.setData({
         authText: getApiErrorMessage(error),
         authTone: 'error',
-        authUserId: ''
+        authUserId: '',
+        authRequestId: getApiRequestId(error)
       })
     }
+  },
+
+  copyRequestId(event: WechatMiniprogram.TouchEvent) {
+    const { requestId } = event.currentTarget.dataset as { requestId: string }
+    copyApiRequestId(requestId)
   }
 })