Use json_schema_extra={"env": "FOO"} or use BaseSettings with model_config.

• Replace Field(..., env=...) usages
  File: mcpgateway/config.py

Use model_config = ConfigDict(...) instead.

• Replace all class Config: declarations
  Files: mcpgateway/schemas.py, mcpgateway/types.py

• Rename allow_population_by_field_name → validate_by_name
• Rename schema_extra → json_schema_extra
  Files: mcpgateway/types.py, mcpgateway/schemas.py

• Replace @validator(...) with @field_validator(...)
• Replace @root_validator(pre=True) with @model_validator(pre=True)
  File: mcpgateway/schemas.py
  Lines: 300, 359, 670, 686, 782, 797, 1051, 1136, 1165, 1204

Use @model_serializer and @field_serializer instead.

• Remove json_encoders from model config
  File: mcpgateway/schemas.py

• Replace .dict() with .model_dump()
  Files: admin.py, main.py, manager.py

• Replace .parse_obj() with .model_validate()
  File: manager.py

Use datetime.now(datetime.UTC) instead.

• Replace all datetime.utcnow()
  Files:

  • tool_service.py
  • server_service.py
  • prompt_service.py
  • logging_service.py
  • manager.py
  • discovery.py
  • forward.py
  • version.py
  • create_jwt_token.py
  • Tests: test_manager.py, test_discovery.py, test_schemas.py, test_forward.py

• Add missing await response.raise_for_status()
  File: mcpgateway/services/tool_service.py:437

• Replace data=... with content=... when uploading raw bytes
  File affected indirectly: httpx/_models.py:408

• Fix parameter order:
  From: TemplateResponse(name, {"request": request})
  To: TemplateResponse(request, name, {...})
  File: test_ui_version.py