feat: PlatformChannel 支持 AdapterID/AdapterName — 多账号全链路区分

- PlatformChannel 新增 AdapterID + AdapterName 字段
- AddOrUpdatePlatformChannel 接受 adapter 信息参数
- channel_sync 传递 adapter_id/adapter_name
- 消息处理路径传递 adapter_name

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

backend/ai-core/internal/background/thinker.go

@@ -46,6 +46,8 @@ type PlatformChannel struct {
 	ChannelType string // group, private
 	ChannelID   string // group ID or user OBv11 number
 	ChannelName string // group name or user display name (resolved at runtime)
+	AdapterID   string // unique config ID of the adapter instance
+	AdapterName string // config name, e.g. "qq-main"
 }
 
 // PlatformFormat describes how proactive message targets are formatted for a platform.
@@ -312,7 +314,7 @@ func (t *Thinker) SetBotUID(platform, uid string) {
 }
 
 // AddOrUpdatePlatformChannel adds or updates a platform channel with resolved display name.
-func (t *Thinker) AddOrUpdatePlatformChannel(platform, channelType, channelID, channelName string) {
+func (t *Thinker) AddOrUpdatePlatformChannel(platform, channelType, channelID, channelName, adapterID, adapterName string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
 
@@ -321,6 +323,12 @@ func (t *Thinker) AddOrUpdatePlatformChannel(platform, channelType, channelID, c
 			if channelName != "" {
 				t.platformChannels[i].ChannelName = channelName
 			}
+			if adapterID != "" {
+				t.platformChannels[i].AdapterID = adapterID
+			}
+			if adapterName != "" {
+				t.platformChannels[i].AdapterName = adapterName
+			}
 			return
 		}
 	}
@@ -330,6 +338,8 @@ func (t *Thinker) AddOrUpdatePlatformChannel(platform, channelType, channelID, c
 		ChannelType: channelType,
 		ChannelID:   channelID,
 		ChannelName: channelName,
+		AdapterID:   adapterID,
+		AdapterName: adapterName,
 	})
 }