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/chat.tsx

@@ -6,6 +6,7 @@ import { Tag } from "./primitives";
 import { Icon, type IconName } from "./Icon";
 import { WakePath } from "./status";
 import { modeBody } from "./messages";
+import { UserMessageActions } from "./messages/MessageActions";
 import { renderContent } from "../lib/renderContent";
 import { splitBubble, type ContentPart } from "../lib/parseContent";
 
@@ -332,7 +333,9 @@ export function SplitChatBubble({
   // bubble and below the last — never inside a bubble's body.
   const align = message.role === "user" ? "right" : "left";
   return (
-    <div className={`flex flex-col gap-2.5 ${message.role === "user" ? "items-end" : ""}`}>
+    <div
+      className={`flex flex-col gap-2.5 ${message.role === "user" ? "group relative items-end" : ""}`}
+    >
       <BubbleNotes items={head} align={align} />
       {segments.map((seg, i) =>
         message.role === "user" ? (
@@ -348,6 +351,7 @@ export function SplitChatBubble({
         ),
       )}
       <BubbleNotes items={tail} align={align} />
+      {message.role === "user" ? <UserMessageActions message={message} /> : null}
     </div>
   );
 }
@@ -362,7 +366,7 @@ function UserBubble({ message, mode }: { message: ChatMessage; mode: Mode }): Re
       <span className="whitespace-pre-wrap">{renderContent(message.content)}</span>
     ) : null;
   return (
-    <div className="mu-rise-in flex flex-col items-end gap-0.5">
+    <div className="mu-rise-in group relative flex flex-col items-end gap-0.5">
       <div className="liquid-glass-accent max-w-[80%] rounded-[var(--mu-radius-lg)] px-4 py-2.5 text-sm text-white shadow-[var(--mu-shadow-1)]">
         {message.image ? (
           <img
@@ -375,6 +379,7 @@ function UserBubble({ message, mode }: { message: ChatMessage; mode: Mode }): Re
       </div>
       <SourceLabel deviceId={message.deviceId} role={message.role} />
       <SenderLabel name={message.senderName} />
+      <UserMessageActions message={message} />
     </div>
   );
 }