feat: rag初始版

common/eino/status_enum.go

@@ -0,0 +1,12 @@
+package eino
+
+// TaskStatus 任务状态
+type TaskStatus string
+
+const (
+	TaskStatusPending   TaskStatus = "pending"   // 待处理
+	TaskStatusRunning   TaskStatus = "running"   // 运行中
+	TaskStatusCompleted TaskStatus = "completed" // 已完成
+	TaskStatusFailed    TaskStatus = "failed"    // 失败
+	TaskStatusCancelled TaskStatus = "cancelled" // 已取消
+)