Fix: Enable Pyright and Fix Typing Errors in Datasets Controller (#26425)

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

api/controllers/console/datasets/external.py

@@ -1,3 +1,5 @@
+from typing import cast
+
 from flask import request
 from flask_login import current_user
 from flask_restx import Resource, fields, marshal, reqparse
@@ -9,13 +11,14 @@ from controllers.console.datasets.error import DatasetNameDuplicateError
 from controllers.console.wraps import account_initialization_required, setup_required
 from fields.dataset_fields import dataset_detail_fields
 from libs.login import login_required
+from models.account import Account
 from services.dataset_service import DatasetService
 from services.external_knowledge_service import ExternalDatasetService
 from services.hit_testing_service import HitTestingService
 from services.knowledge_service import ExternalDatasetTestService
 
 
-def _validate_name(name):
+def _validate_name(name: str) -> str:
     if not name or len(name) < 1 or len(name) > 100:
         raise ValueError("Name must be between 1 to 100 characters.")
     return name
@@ -274,7 +277,7 @@ class ExternalKnowledgeHitTestingApi(Resource):
             response = HitTestingService.external_retrieve(
                 dataset=dataset,
                 query=args["query"],
-                account=current_user,
+                account=cast(Account, current_user),
                 external_retrieval_model=args["external_retrieval_model"],
                 metadata_filtering_conditions=args["metadata_filtering_conditions"],
             )