feat: Implement Role-Based Access Control (RBAC) for search space resources.

-Introduce granular permissions for documents, chats, podcasts, and logs.
- Update routes to enforce permission checks for creating, reading, updating, and deleting resources. - Refactor user and search space interactions to align with RBAC model, removing ownership checks in favor of permission validation.

surfsense_backend/app/agents/researcher/qna_agent/configuration.py

@@ -18,7 +18,6 @@ class Configuration:
     relevant_documents: list[
         Any
     ]  # Documents provided directly to the agent for answering
-    user_id: str  # User identifier
     search_space_id: int  # Search space identifier
     language: str | None = None  # Language for responses