refactor: update module docstrings for clarity and consistency

backend/app/workers/__init__.py

@@ -0,0 +1 @@
+"""Background worker tasks and queue processing utilities."""

backend/app/workers/queue.py

@@ -1,3 +1,5 @@
+"""RQ queue and Redis connection helpers for background workers."""
+
 from __future__ import annotations
 
 from redis import Redis
@@ -7,8 +9,10 @@ from app.core.config import settings
 
 
 def get_redis() -> Redis:
+    """Create a Redis client from configured settings."""
     return Redis.from_url(settings.redis_url)
 
 
 def get_queue(name: str) -> Queue:
+    """Return an RQ queue bound to the configured Redis connection."""
     return Queue(name, connection=get_redis())