feat: 全链路优化 — 死锁修复、MD3主题、上下文持久化、群聊自然化、打字状态、知识库

**死锁根因修复**
- periodicThinkLoop:1015 orphaned lock → 删除（字段已原子化）
- RecordUserMessage 隔离为 recordMu
- atomic.Int64 替换 lastUserMessage/lastThinkTime 等

**MD3 / Android 17 主题**
- 毛玻璃卡片 (backdrop-filter)
- MD3 色彩令牌 (pink primary #f472b6)
- icons.js 独立矢量图标库 + 运行时 emoji 替换
- 无边框卡片、圆角按钮、阴影层次

**上下文持久化**
- AddMessage → saveToDB 异步写 PostgreSQL
- LoadFromDB 恢复 (admin-session-main + 懒加载)
- LLMMessage.Timestamp 字段

**群聊与适配器**
- group_ambient 模式: 非@消息让 LLM 自己判断是否插话
- 戳一戳动作消息总是回复
- NapCat 打字状态 (set_input_status, 最小3秒显示)
- HTTP API 配置 (http_url/http_token)

**知识库 & 防编造**
- knowledge.CanHandle 对 chat 意图也触发
- 关键词预筛选避免无关 embedding 调用
- persona + synthesizer 三重诚实规则
- 工具结果持久化到会话历史

**平台桥接器**
- detached:true Go进程独立存活
- ethend 重启自动接管已运行服务
- stop() 接管模式 taskkill/F/ PID
- Windows netstat 替代 fuser 获取 PID
- 重复适配器种子逻辑修复
- 失败转发日志 Direction: error

**崩溃诊断**
- crashlog 包 (Recover + WrapHTTP + LLMCall)
- /api/v1/debug/goroutines 端点
- thinker 操作日志 + 30s stats
- 日志写入 logs/ 目录持久化

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

backend/platform-bridge/internal/adapter/qq/adapter.go

@@ -32,8 +32,11 @@ type Adapter struct {
 	port           string
 	accessToken    string
 	remoteURL      string // NapCat OneBot WS server URL, used in client mode
-	sendIntervalMs int    // minimum interval between consecutive messages
-	selfID         string // bot's own QQ number, populated from incoming messages
+	httpURL        string // NapCat HTTP API base URL (optional, derived from remoteURL if empty)
+	httpToken_     string // NapCat HTTP API access token (optional, uses accessToken if empty)
+	sendIntervalMs int       // minimum interval between consecutive messages
+	lastTypingSent time.Time // last time typing indicator was sent, for min display duration
+	selfID         string    // bot's own QQ number, populated from incoming messages
 	conn           *websocket.Conn
 	connMu         sync.Mutex
 	connected      bool
@@ -64,6 +67,14 @@ func NewAdapter(configID, configName, mode, port, accessToken, remoteURL string,
 	}
 }
 
+// SetHTTPConfig sets the optional HTTP API configuration.
+func (a *Adapter) SetHTTPConfig(url, token string) {
+	a.httpURL = url
+	if token != "" {
+		a.httpToken_ = token
+	}
+}
+
 func (a *Adapter) PlatformName() string   { return "obv11" }
 func (a *Adapter) ConfigID() string      { return a.configID }
 func (a *Adapter) ConfigName() string    { return a.configName }
@@ -97,8 +108,12 @@ func (a *Adapter) SetGroupName(groupID int64, name string) {
 	a.groupNamesMu.Unlock()
 }
 
-// httpBase derives the HTTP base URL from the WebSocket remote URL.
+// httpBase returns the HTTP API base URL.
+// Uses configured httpURL if set, otherwise derives from WebSocket remoteURL.
 func (a *Adapter) httpBase() string {
+	if a.httpURL != "" {
+		return a.httpURL
+	}
 	httpBase := strings.Replace(a.remoteURL, "ws://", "http://", 1)
 	httpBase = strings.Replace(httpBase, "wss://", "https://", 1)
 	if idx := strings.LastIndex(httpBase, "/"); idx > 8 {
@@ -107,6 +122,48 @@ func (a *Adapter) httpBase() string {
 	return httpBase
 }
 
+// httpToken returns the HTTP API access token.
+func (a *Adapter) httpToken() string {
+	if a.httpToken_ != "" {
+		return a.httpToken_
+	}
+	return a.accessToken
+}
+
+// SetTypingStatus sends a typing indicator to a private chat user.
+// eventType: 1 = typing started, 0 = typing stopped.
+// This uses the NapCat HTTP API (not standard OneBot v11).
+// Enforces a minimum 3s display duration.
+func (a *Adapter) SetTypingStatus(userID int64, eventType int) error {
+	if eventType == 0 {
+		// 确保"正在输入"至少显示了 3 秒
+		if time.Since(a.lastTypingSent) < 3*time.Second {
+			time.Sleep(3*time.Second - time.Since(a.lastTypingSent))
+		}
+	} else {
+		a.lastTypingSent = time.Now()
+	}
+	url := a.httpBase() + "/set_input_status"
+	if token := a.httpToken(); token != "" {
+		url += "?access_token=" + token
+	}
+	body, _ := json.Marshal(map[string]interface{}{
+		"user_id":    fmt.Sprintf("%d", userID),
+		"event_type": eventType,
+	})
+	resp, err := http.Post(url, "application/json", strings.NewReader(string(body)))
+	if err != nil {
+		log.Printf("[qq] set_input_status error: %v (url=%s)", err, url)
+		return fmt.Errorf("set_input_status: %w", err)
+	}
+	resp.Body.Close()
+	if resp.StatusCode != 200 {
+		log.Printf("[qq] set_input_status HTTP %d (url=%s)", resp.StatusCode, url)
+		return fmt.Errorf("set_input_status: HTTP %d", resp.StatusCode)
+	}
+	return nil
+}
+
 // fetchGroupName tries to resolve a group name via NapCat HTTP API (client mode).
 func (a *Adapter) fetchGroupName(groupID int64) {
 	if a.mode != "client" || a.remoteURL == "" {