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.

cmd/server/wire.go

@@ -63,6 +63,7 @@ func ProvideRouter(
 	activityService service.UserActivityService,
 	casbinService service.CasbinService,
 	wsHandler *handler.WSHandler,
+	liveKitHandler *handler.LiveKitHandler,
 ) *router.Router {
 	return router.New(router.RouterDeps{
 		UserRepo:                 userRepo,
@@ -92,6 +93,7 @@ func ProvideRouter(
 		QRCodeHandler:            qrcodeHandler,
 		MaterialHandler:          materialHandler,
 		CallHandler:              callHandler,
+			LiveKitHandler:           liveKitHandler,
 		ReportHandler:            reportHandler,
 		AdminReportHandler:       adminReportHandler,
 		VerificationHandler:      verificationHandler,