fix: Phase 6联调 — 插件管理器端口修正 + 多模型配置系统整合 + 历史消息刷新修复

## 调试日志

### 1. 插件管理器启动失败
- **症状**: DevTools 显示插件管理器一直"已停止"，手动启动正常
- **排查**: 对比 process-manager.js 传入的环境变量 vs plugin-manager config.go 读取的变量
- **根因**: config.js 传入 PLUGIN_MANAGER_PORT=8094，但 config.go 读取 os.Getenv("PORT")，env 名不匹配。且 process.env 中 PORT 泄露时被误读为 9090，与 DevTools 端口冲突
- **修复**: config.js 将 PLUGIN_MANAGER_PORT → PORT，使 env 名与代码一致 (c3055f4)

### 2. 历史消息刷新后消失
- **症状**: 浏览器刷新后聊天历史清空
- **排查**: WebSocket history_response handler 中 if (msg.messages) 对空数组 [] 为 truthy
- **根因**: 后端返回空的 history_response (缓存为空) 时，空数组覆盖了 HTTP 已加载的消息
- **修复**: useWebSocket.ts 改为 if (msg.messages && msg.messages.length > 0)，空数组走 else-if 分支仅打日志，不覆盖已有消息

### 3. Phase 6 多模型配置系统
- Gateway: ModelsConfigStore (JSON文件持久化) + Admin CRUD API (providers/models/routing)
- ai-core: ModelSelector 支持按 purpose 选择 + fallback_chain，无配置时回退 .env
- DevTools: 模型配置管理面板 (Providers/Models/Routing 三Tab)、在线模型查询代理、路由表单 checkbox 多选、关键词搜索过滤
- .gitignore: models.json + platform_configs.json

### 4. 多端客户端追踪
- Hub 新增 knownClients 映射 (clientID → KnownClient)，在线/离线状态追踪
- 客户端备注持久化到 PostgreSQL
- DevTools 客户端管理面板

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/web/src/store/chatStore.ts

@@ -21,9 +21,16 @@ interface ChatStore {
   isLoadingHistory: boolean;
   historyPage: number;
 
+  // 多气泡消息队列：确保气泡依次出现 + 逐字动画
+  messageQueue: Message[];
+
   addMessage: (message: Message) => void;
   appendToLastMessage: (content: string) => void;
   finishStreaming: () => void;
+  /** 将一个消息加入队列，等待上一个气泡的逐字动画完成后再展示 */
+  enqueueMessage: (message: Message) => void;
+  /** 当前气泡逐字动画完成后调用：关闭 isStreaming，出队下一个 */
+  onTypewriterDone: (messageId: string) => void;
   setMessages: (messages: Message[]) => void;
   setTyping: (typing: boolean) => void;
   clearMessages: () => void;
@@ -49,6 +56,7 @@ export const useChatStore = create<ChatStore>((set) => ({
   hasMoreMessages: false,
   isLoadingHistory: false,
   historyPage: 1,
+  messageQueue: [],
 
   addMessage: (message) =>
     set((state) => ({
@@ -84,14 +92,48 @@ export const useChatStore = create<ChatStore>((set) => ({
           isStreaming: false,
         };
       }
-      return { messages: msgs, isTyping: false };
+      // Process queued messages after streaming finishes
+      const queue = [...state.messageQueue];
+      if (queue.length > 0) {
+        const next = queue.shift()!;
+        return {
+          messages: [...msgs, { ...next, isStreaming: true }],
+          messageQueue: queue,
+          isTyping: false,
+        };
+      }
+      return { messages: msgs, isTyping: false, messageQueue: queue };
+    }),
+
+  enqueueMessage: (message) =>
+    set((state) => ({
+      messageQueue: [...state.messageQueue, message],
+    })),
+
+  onTypewriterDone: (messageId) =>
+    set((state) => {
+      // Mark this specific message as no longer streaming
+      const msgs = state.messages.map((m) =>
+        m.id === messageId ? { ...m, isStreaming: false } : m
+      );
+      // Process next queued message
+      const queue = [...state.messageQueue];
+      if (queue.length > 0) {
+        const next = queue.shift()!;
+        return {
+          messages: [...msgs, { ...next, isStreaming: true }],
+          messageQueue: queue,
+          isTyping: false,
+        };
+      }
+      return { messages: msgs, isTyping: false, messageQueue: queue };
     }),
 
   setMessages: (messages) => set({ messages, isTyping: false }),
 
   setTyping: (typing) => set({ isTyping: typing }),
 
-  clearMessages: () => set({ messages: [], isTyping: false, hasMoreMessages: false, historyPage: 1 }),
+  clearMessages: () => set({ messages: [], isTyping: false, hasMoreMessages: false, historyPage: 1, messageQueue: [] }),
 
   setContinuousMode: (enabled) => set({ continuousMode: enabled }),