feat: add video URL support in MediaContent and update token counting logic

main.go

@@ -80,6 +80,8 @@ func main() {
 	// Initialize options
 	model.InitOptionMap()
 
+	service.InitTokenEncoders()
+
 	if common.RedisEnabled {
 		// for compatibility with old versions
 		common.MemoryCacheEnabled = true
@@ -133,8 +135,6 @@ func main() {
 		common.SysLog("pprof enabled")
 	}
 
-	service.InitTokenEncoders()
-
 	// Initialize HTTP server
 	server := gin.New()
 	server.Use(gin.CustomRecovery(func(c *gin.Context, err any) {