refactor: QQ → OBv11 重命名 + 平台格式统一抽象

- 所有对外称呼从 QQ 改为 OBv11（注释/提示词/日志/配置项）
- 新增 PlatformFormat 结构体，统一管理平台消息标记格式
- defaultPlatformFormats() 注册表替代硬编码 qqTargetRe
- extractProactiveMessage 改为 Thinker 方法，遍历格式注册表匹配
- 配置项重命名: QQ_BOT_PORT → OBV11_BOT_PORT, QQBotPort → OBv11BotPort
- 标记格式: 【QQ群聊】→【OBv11群聊】、【QQ私聊】→【OBv11私聊】

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

backend/platform-bridge/cmd/main.go

@@ -298,16 +298,16 @@ func main() {
 			}
 			// Sync admin identities from config fields.
 			syncAdminUIDs(mapper, platform, fields, cfg.AdminNickname)
-			// Restart QQ reader when QQ config changes.
+			// Restart OBv11 reader when OBv11 config changes.
 			if platform == "qq" {
-				startQQReaders(router)
+				startOBv11Readers(router)
 			}
 		} else {
 			router.RemoveAdapter(name)
 			fmt.Printf("Platform adapter removed: %s\n", name)
 			// Cancel reader goroutines for removed adapter.
 			if platform == "qq" {
-				startQQReaders(router)
+				startOBv11Readers(router)
 			}
 		}
 	})
@@ -324,8 +324,8 @@ func main() {
 	blh := handler.NewBlocklistHandler(blocklistStore)
 	blh.RegisterRoutes(mux)
 
-	// Start QQ message reader loop.
-	startQQReaders(router)
+	// Start OBv11 message reader loop.
+	startOBv11Readers(router)
 
 	addr := ":" + cfg.Port
 	srv := &http.Server{Addr: addr, Handler: mux}
@@ -355,8 +355,8 @@ func main() {
 var qqReaderCancels = make(map[string]context.CancelFunc)
 var qqReaderCancelsMu sync.Mutex
 
-// startQQReaders cancels any existing QQ readers and starts one per registered QQ adapter.
-func startQQReaders(router *bridge.PlatformRouter) {
+// startOBv11Readers cancels any existing OBv11 readers and starts one per registered OBv11 adapter.
+func startOBv11Readers(router *bridge.PlatformRouter) {
 	// Cancel all existing readers.
 	qqReaderCancelsMu.Lock()
 	for _, cancel := range qqReaderCancels {
@@ -392,7 +392,7 @@ func startQQReaders(router *bridge.PlatformRouter) {
 		// Dispatcher: route to worker by session hash so same conversation stays ordered.
 		go func() {
 			for msg := range rawCh {
-				idx := hashQQSession(msg) % numWorkers
+				idx := hashOBv11Session(msg) % numWorkers
 				workerChs[idx] <- msg
 			}
 			for i := 0; i < numWorkers; i++ {
@@ -503,7 +503,7 @@ func createAdapters(cfg *config.Config, store *config.Store) []bridge.PlatformAd
 func createSingleAdapter(cfg *config.Config, platform, configName string, fields map[string]string) bridge.PlatformAdapter {
 	switch platform {
 	case "qq":
-		port := cfg.QQBotPort
+		port := cfg.OBv11BotPort
 		if p, ok := fields["bot_port"]; ok && p != "" {
 			port = p
 		}
@@ -564,8 +564,8 @@ func mergeFields(cfg *config.Config, platform string, stored *config.PlatformCon
 	if fields["webhook_url"] == "" && cfg.TelegramWebhookURL != "" && platform == "telegram" {
 		fields["webhook_url"] = cfg.TelegramWebhookURL
 	}
-	if fields["bot_port"] == "" && cfg.QQBotPort != "" && platform == "qq" {
-		fields["bot_port"] = cfg.QQBotPort
+	if fields["bot_port"] == "" && cfg.OBv11BotPort != "" && platform == "qq" {
+		fields["bot_port"] = cfg.OBv11BotPort
 	}
 	return fields
 }
@@ -928,10 +928,10 @@ func hasOnlySilentMessages(messages []bridge.ResponseMessage) bool {
 	return true
 }
 
-// hashQQSession returns a hash for dispatching a QQ message to a worker.
+// hashOBv11Session returns a hash for dispatching an OBv11 message to a worker.
 // Messages from the same conversation (private or group) get the same hash,
 // preserving ordering within a session while allowing cross-session parallelism.
-func hashQQSession(msg *qqadapter.OBv11Message) uint32 {
+func hashOBv11Session(msg *qqadapter.OBv11Message) uint32 {
 	h := fnv.New32a()
 	h.Write([]byte(msg.MessageType))
 	h.Write([]byte(":"))
@@ -966,7 +966,7 @@ func parseIntOr(s string, defaultVal int) int {
 func seedIdentities(m *bridge.IdentityMapper, store *config.Store, adminNickname string) {
 	// From environment variables.
 	for _, entry := range []struct{ envKey, platform string }{
-		{"QQ_ADMIN_UID", "qq"},
+		{"OBV11_ADMIN_UID", "obv11"},
 		{"TELEGRAM_ADMIN_UID", "telegram"},
 	} {
 		if raw := os.Getenv(entry.envKey); raw != "" {