[Chore/Refactor] Improve type annotations in models module (#25281)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>

api/services/agent_service.py

@@ -1,5 +1,5 @@
 import threading
-from typing import Optional
+from typing import Any, Optional
 
 import pytz
 from flask_login import current_user
@@ -68,7 +68,7 @@ class AgentService:
         if not app_model_config:
             raise ValueError("App model config not found")
 
-        result = {
+        result: dict[str, Any] = {
             "meta": {
                 "status": "success",
                 "executor": executor,