fix(task): execute dispatched jobs and persist run records

Asynq func handlers now go through ProcessTask so admin execution
rows leave pending. The in-process worker resolves admin type
identifiers and writes the same w_task_executions table. Remove
the no-op admin system_cleanup that shadowed the upload handler.

backend/plugins/drivers/driver_asynq_worker/executor.go

@@ -265,8 +265,9 @@ func ProcessTask(ctx context.Context, t *asynq.Task) error {
 
 	taskID := t.ResultWriter().TaskID()
 
-	// 注入 taskID 到 context
+	// 注入 taskID 到 context，并把原始 asynq.Task 交给适配器 Handler。
 	ctx = withTaskID(ctx, taskID)
+	ctx = context.WithValue(ctx, asynqTaskCtxKey{}, t)
 
 	// 查找处理器
 	handler, ok := getHandler(t.Type())
@@ -277,18 +278,20 @@ func ProcessTask(ctx context.Context, t *asynq.Task) error {
 		return err
 	}
 
-	// 加载或动态创建执行记录
+	// 加载或动态创建执行记录。无 DB 时仍执行业务 Handler，避免测试/精简拓扑 panic。
+	var execution *TaskExecution
 	now := time.Now()
-	execution, err := getOrCreateTaskExecution(ctx, taskID, t, taskPayload, now)
-	if err == nil {
-		updateExecutionOnStart(ctx, execution, now)
+	if getDB(ctx) != nil {
+		var err error
+		execution, err = getOrCreateTaskExecution(ctx, taskID, t, taskPayload, now)
+		if err == nil {
+			updateExecutionOnStart(ctx, execution, now)
+		}
 	}
 
 	if execution != nil {
 		AppendLog(ctx, "[系统] 开始执行异步任务 [名称: %s, 类型: %s]，重试次数: %d/%d",
 			execution.TaskName, t.Type(), execution.RetryCount, execution.MaxRetry)
-	} else {
-		AppendLog(ctx, "[系统] 开始执行异步任务 [类型: %s]", t.Type())
 	}
 
 	// 开始计时