fix: mock数据路径问题

backend/gateway/controller/asset_controller.go

@@ -1431,7 +1431,7 @@ func (ctrl *AssetController) ImageGeneration(c *gin.Context) {
 
 	// 开发模式下使用 mock 数据
 	if config.Load().Server.Mode == "debug" {
-		mockData, err := os.ReadFile("/Users/liulujian/Documents/code/TopFansByGithub/mock/minimax.json")
+		mockData, err := os.ReadFile(filepath.Join("..", "..", "mock", "minimax.json"))
 		if err != nil {
 			response.Error(c, 500, "Failed to read mock data: "+err.Error())
 			return