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/components/Icon.tsx

@@ -47,7 +47,10 @@ export type IconName =
   | "terminal"       // 🖥 code (terminal_rounded)
   | "image"          // 🖼 attachment/vision (image_rounded)
   | "phone"          // 📞 voice call / hang up (call_rounded)
-  | "menu"           // ☰ drawer/open nav (menu_rounded);
+  | "menu"           // ☰ drawer/open nav (menu_rounded)
+  | "edit"           // ✎ edit a message (edit_rounded)
+  | "trash"          // 🗑 delete a message (delete_rounded)
+  | "more"           // ⋯ message action menu (more_horiz_rounded);
 
 const ICON_PATHS: Record<IconName, string> = {
   chart:
@@ -128,6 +131,12 @@ const ICON_PATHS: Record<IconName, string> = {
     "M6.6 10.8a15.1 15.1 0 0 0 6.6 6.6l2.2-2.2c.3-.3.7-.4 1-.2 1.1.4 2.3.6 3.6.6.6 0 1 .4 1 1V20c0 .6-.4 1-1 1C10.6 21 3 13.4 3 4c0-.6.4-1 1-1h3.5c.6 0 1 .4 1 1 0 1.3.2 2.5.6 3.6.1.3 0 .7-.2 1l-2.3 2.2Z",
   menu:
     "M4 6h16v2H4V6Zm0 5h16v2H4v-2Zm0 5h16v2H4v-2Z",
+  edit:
+    "M3 17.25V21h3.75L17.8 9.94l-3.75-3.75L3 17.25ZM20.7 7.04a1 1 0 0 0 0-1.41l-2.34-2.34a1 1 0 0 0-1.41 0l-1.83 1.83 3.75 3.75 1.83-1.83Z",
+  trash:
+    "M6 19a2 2 0 0 0 2 2h8a2 2 0 0 0 2-2V7H6v12ZM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4Z",
+  more:
+    "M6 10a2 2 0 1 0 0 4 2 2 0 0 0 0-4Zm6 0a2 2 0 1 0 0 4 2 2 0 0 0 0-4Zm6 0a2 2 0 1 0 0 4 2 2 0 0 0 0-4Z",
 };
 
 export interface IconProps {