feat(auth): 登录页(用户名/密码换 API token)+ 前端全链路登录态

后端:
- POST /api/auth/login:admin 账密(Settings 默认 admin/admin123,
  ADMIN_USER/ADMIN_PASSWORD 可覆盖)换取共享 api_token,免 token 中间件
- 防爆破:同 IP 15min 窗口内 5 次失败锁 15min(429),成功登录清零
- 错误信息统一「用户名或密码错误」(防用户名枚举)
- 测试 7 个新增(TDD),全量 500 绿

前端:
- LoginView + 路由守卫(未登录跳 /login,回跳 redirect)
- axios 请求拦截器自动带 Bearer;401 清登录态回登录页
- 媒体直链统一 mediaUrl() 带 ?token=(img/audio 标签发不了 header),
  替换 4 处裸拼;downloadBlob 手动带头
- isLoggedIn 按 key 存在判定 — 后端鉴权关闭时空 token 不锁死登录页
- MainLayout 侧栏底部退出登录

compose:两份编排透传 ADMIN_USER/ADMIN_PASSWORD(默认 admin/admin123)

Co-Authored-By: Claude Code <noreply@anthropic.com>

yunkes/src/components/MessageBubble.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import { Microphone, VideoPlay, Document, Picture, Paperclip, User } from '@element-plus/icons-vue'
+import { mediaUrl } from '@/api/client'
 import type { Message } from '@/api/types'
 import { formatDuration, formatTime, wechatTypeLabel } from '@/utils/format'
 
@@ -103,7 +104,7 @@ const bestMediaUrl = computed<string | undefined>(() => {
  */
 const localSrc = computed<string | undefined>(() => {
   const hash = props.message.media_hash
-  return hash ? `/api/media/${hash}` : undefined
+  return hash ? mediaUrl(hash) : undefined
 })
 
 const IMAGE_EXTS = new Set(['jpg', 'jpeg', 'webp', 'png', 'gif', 'bmp', 'tif', 'tiff'])

yunkes/src/components/VoiceClipModal.vue

@@ -2,6 +2,7 @@
 import { computed, ref, watch } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { getCustomers, getVoiceClips, matchVoiceClip, search } from '@/api'
+import { mediaUrl } from '@/api/client'
 import type { Customer, VoiceClip } from '@/api/types'
 import { formatCallDuration, formatTime } from '@/utils/format'
 
@@ -149,7 +150,7 @@ const displayItems = computed(() =>
 function playClip(row: VoiceClip): void {
   // Local-first: 优先本地化的 /api/media/{media_hash}，回退到 OSS 直链
   // (mirrors CallList.playRecord)。
-  const local = row.media_hash ? `/api/media/${row.media_hash}` : null
+  const local = row.media_hash ? mediaUrl(row.media_hash) : null
   const url = local ?? row.oss_file_name
   if (!url) {
     ElMessage.info('该片段无录音文件')