revert: completely remove all Sora functionality

backend/internal/server/routes/gateway.go

@@ -23,11 +23,6 @@ func RegisterGatewayRoutes(
 	cfg *config.Config,
 ) {
 	bodyLimit := middleware.RequestBodyLimit(cfg.Gateway.MaxBodySize)
-	soraMaxBodySize := cfg.Gateway.SoraMaxBodySize
-	if soraMaxBodySize <= 0 {
-		soraMaxBodySize = cfg.Gateway.MaxBodySize
-	}
-	soraBodyLimit := middleware.RequestBodyLimit(soraMaxBodySize)
 	clientRequestID := middleware.ClientRequestID()
 	opsErrorLogger := handler.OpsErrorLoggerMiddleware(opsService)
 	endpointNorm := handler.InboundEndpointMiddleware()
@@ -163,28 +158,6 @@ func RegisterGatewayRoutes(
 		antigravityV1Beta.POST("/models/*modelAction", h.Gateway.GeminiV1BetaModels)
 	}
 
-	// Sora 专用路由（强制使用 sora 平台）
-	soraV1 := r.Group("/sora/v1")
-	soraV1.Use(soraBodyLimit)
-	soraV1.Use(clientRequestID)
-	soraV1.Use(opsErrorLogger)
-	soraV1.Use(endpointNorm)
-	soraV1.Use(middleware.ForcePlatform(service.PlatformSora))
-	soraV1.Use(gin.HandlerFunc(apiKeyAuth))
-	soraV1.Use(requireGroupAnthropic)
-	{
-		soraV1.POST("/chat/completions", h.SoraGateway.ChatCompletions)
-		soraV1.GET("/models", h.Gateway.Models)
-	}
-
-	// Sora 媒体代理（可选 API Key 验证）
-	if cfg.Gateway.SoraMediaRequireAPIKey {
-		r.GET("/sora/media/*filepath", gin.HandlerFunc(apiKeyAuth), h.SoraGateway.MediaProxy)
-	} else {
-		r.GET("/sora/media/*filepath", h.SoraGateway.MediaProxy)
-	}
-	// Sora 媒体代理（签名 URL，无需 API Key）
-	r.GET("/sora/media-signed/*filepath", h.SoraGateway.MediaProxySigned)
 }
 
 // getGroupPlatform extracts the group platform from the API Key stored in context.