feat(call): integrate LiveKit for voice and video calling

Replace the manual WebRTC signaling implementation with LiveKit SFU. This includes:
- Adding LiveKit service, handler, and configuration.
- Updating Docker Compose to include LiveKit server, Redis, and PostgreSQL.
- Refactoring `CallService` and `WSHandler` to support LiveKit room readiness instead of raw SDP/ICE relaying.
- Adding new API endpoints for LiveKit token generation and webhooks.
- Removing deprecated WebRTC configuration and manual signaling DTOs.

internal/wire/service.go

@@ -62,6 +62,7 @@ var ServiceSet = wire.NewSet(
 	ProvideHotRankWorker,
 	ProvideMaterialService,
 	ProvideCallService,
+	ProvideLiveKitService,
 	ProvideReportService,
 	ProvideAdminReportService,
 	ProvideVerificationService,
@@ -463,6 +464,14 @@ func ProvideCallService(
 	return service.NewCallService(callRepo, publisher, cfg, db, redisClient)
 }
 
+// ProvideLiveKitService 提供 LiveKit 服务
+func ProvideLiveKitService(
+	cfg *config.Config,
+	logger *zap.Logger,
+) service.LiveKitService {
+	return service.NewLiveKitService(cfg, logger)
+}
+
 // ProvideReportService 提供举报服务
 func ProvideReportService(
 	reportRepo repository.ReportRepository,