refactor: Move utility services to a dedicated 'services' module

- Updated import paths for LLM, connector, query, and streaming services to reflect their new location in the 'services' module.
- Removed obsolete utility service files that have been migrated.

surfsense_backend/app/agents/researcher/state.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from dataclasses import dataclass, field
 from typing import List, Optional, Any
 from sqlalchemy.ext.asyncio import AsyncSession
-from app.utils.streaming_service import StreamingService
+from app.services.streaming_service import StreamingService
 
 @dataclass
 class State: