fix: TLS连接池复用 + 禁言检测 + 降级回复静默

- llm/openai.go: 移除DisableKeepAlives，启用连接池(100idle/20perhost/90s)
  修复频繁TLS握手超时问题
- qq/adapter.go: 监听group_ban通知，发送前检查禁言状态
  防止向被禁言群发消息导致风控
- cmd/main.go: 降级回复仅管理员私聊，群聊静默失败避免怪话
- protocol.go: OBv11Message新增Duration字段
- bridge/router.go: 处理noticeToUnified返回nil(内部消费的通知)

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

@@ -8,6 +8,7 @@ import (
 	"log"
 	"net/http"
 	"regexp"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -46,6 +47,9 @@ type Adapter struct {
 	groupNames   map[int64]string    // group ID → group name cache
 	groupNamesMu sync.RWMutex
 
+	mutedGroups   map[int64]time.Time // group ID → mute expiry (zero = indefinitely muted)
+	mutedGroupsMu sync.RWMutex
+
 	pendingResponses map[string]chan *OBv11APIResponse
 	respMu           sync.Mutex
 }
@@ -64,9 +68,42 @@ func NewAdapter(configID, configName, mode, port, accessToken, remoteURL string,
 		sendIntervalMs:   sendIntervalMs,
 		pendingResponses: make(map[string]chan *OBv11APIResponse),
 		groupNames:       make(map[int64]string),
+			mutedGroups:      make(map[int64]time.Time),
 	}
 }
 
+// IsGroupMuted returns true if the bot is currently muted in the given group.
+func (a *Adapter) IsGroupMuted(groupID int64) bool {
+	a.mutedGroupsMu.RLock()
+	expiry, ok := a.mutedGroups[groupID]
+	a.mutedGroupsMu.RUnlock()
+	if !ok {
+		return false
+	}
+	if expiry.IsZero() {
+		return true
+	}
+	return time.Now().Before(expiry)
+}
+
+// setGroupMuted marks the bot as muted in a group.
+func (a *Adapter) setGroupMuted(groupID int64, duration int64) {
+	a.mutedGroupsMu.Lock()
+	defer a.mutedGroupsMu.Unlock()
+	if duration <= 0 {
+		a.mutedGroups[groupID] = time.Time{}
+	} else {
+		a.mutedGroups[groupID] = time.Now().Add(time.Duration(duration) * time.Second)
+	}
+}
+
+// clearGroupMuted removes the mute status for a group.
+func (a *Adapter) clearGroupMuted(groupID int64) {
+	a.mutedGroupsMu.Lock()
+	delete(a.mutedGroups, groupID)
+	a.mutedGroupsMu.Unlock()
+}
+
 // SetHTTPConfig sets the optional HTTP API configuration.
 func (a *Adapter) SetHTTPConfig(url, token string) {
 	a.httpURL = url
@@ -463,7 +500,23 @@ func (a *Adapter) ToUnified(rawMessage interface{}) (*bridge.UnifiedMessage, err
 }
 
 // noticeToUnified converts an OBv11 notice event (poke/戳一戳 etc.) to a UnifiedMessage.
+// Returns nil when the notice is handled internally (e.g., mute tracking).
 func (a *Adapter) noticeToUnified(msg *OBv11Message) (*bridge.UnifiedMessage, error) {
+	// Handle group mute/ban notices — track mute state internally.
+	if msg.NoticeType == "group_ban" && msg.GroupID != 0 {
+		botUID, _ := strconv.ParseInt(a.selfID, 10, 64)
+		if msg.UserID == botUID {
+			if msg.SubType == "ban" {
+				a.setGroupMuted(msg.GroupID, msg.Duration)
+				log.Printf("[qq] 群 %d 被禁言 (时长=%ds)", msg.GroupID, msg.Duration)
+			} else if msg.SubType == "lift_ban" {
+				a.clearGroupMuted(msg.GroupID)
+				log.Printf("[qq] 群 %d 解除禁言", msg.GroupID)
+			}
+		}
+		return nil, nil // internally handled, no chat message to dispatch
+	}
+
 	senderID := fmt.Sprintf("%d", msg.UserID)
 	senderName := senderID
 
@@ -623,8 +676,8 @@ func (a *Adapter) ReadMessages(ctx context.Context, msgCh chan<- *OBv11Message)
 			fmt.Printf("[qq:%s] self ID captured: %s\n", a.configName, a.selfID)
 		}
 
-		// Dispatch message and notice (poke, etc.) events.
-		if msg.PostType == "message" || (msg.PostType == "notice" && msg.NoticeType == "notify" && msg.SubType == "poke") {
+		// Dispatch message and notice events (poke, group_ban for mute tracking).
+		if msg.PostType == "message" || (msg.PostType == "notice" && (msg.NoticeType == "notify" || msg.NoticeType == "group_ban")) {
 			select {
 			case msgCh <- &msg:
 			case <-ctx.Done():