feat: 平台配置唯一ID — PlatformConfig.ID + adapter全链路传播

- PlatformConfig 新增 ID 字段 (8字节hex，创建时自动生成)
- QQ adapter 新增 configID + ConfigID() 访问器
- ChannelInfo 新增 AdapterID + AdapterName
- createSingleAdapter 接受 configID 参数
- 同一个平台类型的多个配置实例通过 ID 唯一区分

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

backend/platform-bridge/cmd/main.go

@@ -287,7 +287,7 @@ func main() {
 	// Hot-reload: on config save/delete, dynamically replace adapters.
 	ch.SetOnConfigChanged(func(name, platform string, enabled bool, fields map[string]string) {
 		if enabled {
-			a := createSingleAdapter(cfg, platform, name, fields)
+			a := createSingleAdapter(cfg, platform, name, "", fields)  // configID via Store.Set
 			if a == nil {
 				fmt.Printf("WARN: cannot create adapter for %s (platform=%s)\n", name, platform)
 				return
@@ -477,7 +477,7 @@ func createAdapters(cfg *config.Config, store *config.Store) []bridge.PlatformAd
 			platform = stored.Name
 		}
 		fields := mergeFields(cfg, platform, &stored)
-		a := createSingleAdapter(cfg, platform, stored.Name, fields)
+		a := createSingleAdapter(cfg, platform, stored.Name, stored.ID, fields)
 		if a != nil {
 			adapters = append(adapters, a)
 			seen[stored.Name] = true
@@ -491,7 +491,7 @@ func createAdapters(cfg *config.Config, store *config.Store) []bridge.PlatformAd
 			continue
 		}
 		fields := mergeFields(cfg, name, nil)
-		a := createSingleAdapter(cfg, name, name, fields)
+		a := createSingleAdapter(cfg, name, name, "", fields)  // seed adapter, no config ID
 		if a != nil {
 			adapters = append(adapters, a)
 		}
@@ -501,7 +501,7 @@ func createAdapters(cfg *config.Config, store *config.Store) []bridge.PlatformAd
 
 // createSingleAdapter creates one platform adapter from config fields.
 // platform is the base platform type ("qq", "telegram", etc.), configName is the instance key.
-func createSingleAdapter(cfg *config.Config, platform, configName string, fields map[string]string) bridge.PlatformAdapter {
+func createSingleAdapter(cfg *config.Config, platform, configName, configID string, fields map[string]string) bridge.PlatformAdapter {
 	switch platform {
 	case "qq":
 		port := cfg.OBv11BotPort
@@ -528,7 +528,7 @@ func createSingleAdapter(cfg *config.Config, platform, configName string, fields
 				sendIntervalMs = n
 			}
 		}
-		return qqadapter.NewAdapter(configName, mode, port, token, remoteURL, sendIntervalMs)
+		return qqadapter.NewAdapter(configID, configName, mode, port, token, remoteURL, sendIntervalMs)
 	case "telegram":
 		token := cfg.TelegramToken
 		if t, ok := fields["bot_token"]; ok && t != "" {