refactor: port reqparse to Pydantic model (#28949)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

api/libs/helper.py

@@ -10,12 +10,13 @@ import uuid
 from collections.abc import Generator, Mapping
 from datetime import datetime
 from hashlib import sha256
-from typing import TYPE_CHECKING, Any, Optional, Union, cast
+from typing import TYPE_CHECKING, Annotated, Any, Optional, Union, cast
 from zoneinfo import available_timezones
 
 from flask import Response, stream_with_context
 from flask_restx import fields
 from pydantic import BaseModel
+from pydantic.functional_validators import AfterValidator
 
 from configs import dify_config
 from core.app.features.rate_limiting.rate_limit import RateLimitGenerator
@@ -103,6 +104,9 @@ def email(email):
     raise ValueError(error)
 
 
+EmailStr = Annotated[str, AfterValidator(email)]
+
+
 def uuid_value(value):
     if value == "":
         return str(value)