fix(ui): 自定义工具表单 overflow-y-scroll→auto + 认证方式NONE翻译改为'无' + Captain文档爬虫/同步后端

backend/internal/repository/captain_document_repo.go

@@ -84,9 +84,14 @@ func (r *CaptainDocumentRepo) ListByAccount(ctx context.Context, accountID uint,
 	}
 	switch filters.Source {
 	case "web":
-		db = db.Where("external_link <> ''")
+		// Web documents: have external_link but not a PDF.
+		db = db.Where("(content_type IS NULL OR content_type = '' OR content_type != 'application/pdf') AND (file_url = '' OR file_url IS NULL) AND external_link <> ''")
 	case "pdf":
-		db = db.Where("external_link = ''")
+		// PDF documents: identified by content_type or file_url.
+		db = db.Where("content_type = 'application/pdf' OR (file_url IS NOT NULL AND file_url <> '')")
+	case "text":
+		// Text documents: inline content, no external link and no file.
+		db = db.Where("(external_link = '' OR external_link IS NULL) AND (file_url = '' OR file_url IS NULL) AND content <> ''")
 	}
 	switch filters.Filter {
 	case "syncing":
@@ -95,6 +100,11 @@ func (r *CaptainDocumentRepo) ListByAccount(ctx context.Context, accountID uint,
 		db = db.Where("sync_status = ?", model.DocumentSyncStatusFailed)
 	case "synced":
 		db = db.Where("sync_status = ?", model.DocumentSyncStatusSynced)
+	case "stale":
+		// Documents that need updating: never synced or explicitly marked stale,
+		// excluding those currently syncing.
+		db = db.Where("(last_synced_at IS NULL OR sync_status = ?) AND sync_status != ?",
+			model.DocumentSyncStatusStale, model.DocumentSyncStatusPending)
 	}
 	if filters.SearchKey != "" {
 		query := "%" + strings.ToLower(filters.SearchKey) + "%"