feat(web): D 消息编辑/删除前端入口 + 日志聚合前端(Observability后端tail) + 修api-client契约

- D前端: lib/api/messages.ts(patchMessage/deleteMessage,兼容裸DTO与{message}) + MessageActions.tsx(仅user消息; 单击/右键/450ms长按开Miuix玻璃菜单; 编辑弹窗预填+字数→乐观updateMessageById→patchMessage→失败回滚; 删除确认→deleteMessage→removeMessageById; 乐观气泡禁用) + chat.tsx挂载 + Icon加edit/trash/more
- 日志前端: types(AdminLogLine time:string|number) + adminSystem.adminObservabilityLogs + Observability.tsx 后端分级tail(level筛选chip注明'该级及以上'+等宽行HH:mm:ss.SSS·level着色·source·msg+30s刷新) 下半保留WS回显
- Docs/api-client §6a/§4.2 修正: PATCH /messages/{id} 实际返回 {data:<DTO>} 非 {data:{message}}(前端已双向兼容,避免误导Android)
- 前端 build 绿(167 modules); SSR冒烟11 checks
- 遗留: 未实机登录; 菜单absolute理论上边缘可裁切(可改portal)

frontend/web/src/lib/api.ts

@@ -7,6 +7,7 @@
  *   auth.ts          /auth/login, /health
  *   chat.ts          /chat (sync + streaming)
  *   sessions.ts      /sessions (list/create/delete, message history)
+ *   messages.ts      /messages/{id} (PATCH edit / DELETE)
  *   personas.ts      /personas
  *   admin.ts         /admin/* CRUD (personas, users, llm, rag, iot, automations…)
  *   adminChannels.ts /admin/channels/* (adapters, config, platform views, login)
@@ -41,6 +42,8 @@ export {
 } from "./api/sessions";
 export type { MessageDto } from "./api/sessions";
 
+export { deleteMessage, patchMessage } from "./api/messages";
+
 export { fetchPersonas } from "./api/personas";
 
 export {
@@ -100,6 +103,7 @@ export {
   adminBackthink,
   adminListNotifications,
   adminObservabilityAudit,
+  adminObservabilityLogs,
   adminObservabilityMetrics,
   adminObservabilityTrace,
   adminSystemBackup,