fix(platform): 存储与 Agent - 修复配额准入、Live2D 与用户筛选

backend/internal/app/task_creation.go

@@ -118,6 +118,10 @@ func (s *Service) CreateTask(userID string, req CreateTaskRequest) (*model.Task,
 	if activeTasks >= int64(policy.Task.ActiveTaskLimit) {
 		return nil, BadAuthRequest(fmt.Sprintf("同时排队或运行的任务最多 %d 个，请等待已有任务完成", policy.Task.ActiveTaskLimit))
 	}
+	// 媒体任务在扣费和调用上游前确认账号文件容量，避免容量已满仍然计费却无法回存产物。
+	if err := s.requireStoredFileCapacityForTask(userID, taskType, policy); err != nil {
+		return nil, err
+	}
 	task := model.Task{ID: newID(), UserID: userID, TraceID: req.TraceID, RequestID: req.RequestID, ProjectID: req.ProjectID, Type: taskType, Status: model.TaskStatusQueued, Stage: "等待队列调度", Progress: 5, Prompt: prompt, Operation: req.Operation, Provider: req.Provider, Model: req.Model}
 	if req.admission != nil {
 		task.ID = req.admission.ID