feat: improve cloud media playback and Emby compatibility

Based on nowen-video and MoviePilot implementations:
- Mark STRM media as IsRemote=true in Emby MediaSource
- Improve cloud media identification using STRMURL field
- Clean up unused cloud play service scaffolding
- Ensure third-party players (Infuse/Emby) recognize cloud media correctly

internal/service/service.go

@@ -73,8 +73,7 @@ type Container struct {
 	Device          *DeviceService
 
 	stopCtx    context.Context
-	stopCancel context.CancelFunc
-}
+	stopCancel context.CancelFunc}
 
 // New 构建服务容器。
 func New(cfg *config.Config, log *zap.Logger, repos *repository.Container) *Container {
@@ -339,3 +338,5 @@ func (c *Container) Close() {
 // unused guard
 var _ = time.Now
 
+
+