feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/domain/knowledge/internal/dal/model/progress.go

@@ -0,0 +1,14 @@
+package model
+
+type SliceStatus int32
+
+const (
+	SliceStatusProcessing SliceStatus = 0
+	SliceStatusDone       SliceStatus = 1
+	SliceStatusFailed     SliceStatus = 2
+)
+
+type SliceProgress struct {
+	Status    SliceStatus
+	StatusMsg string
+}