feat(database): allow app to run without database connection for HuggingFace Spaces

- Modified init_database() to catch and log errors without raising
- Updated get_db_session() to yield None when no database is available
- Added warning logs when running without database
- Enables deployment on HuggingFace Spaces which doesn't provide PostgreSQL

src/db/session.py

@@ -28,7 +28,7 @@ async def get_session(
         read_only: Use read replica if available
         
     Yields:
-        AsyncSession instance
+        AsyncSession instance or None if no database available
     """
     async with connection_pool_service.get_db_session(
         pool_name="main",
@@ -52,7 +52,9 @@ async def init_database():
             error=str(e),
             exc_info=True
         )
-        raise
+        # Don't raise - allow app to start without database
+        # This is needed for HuggingFace Spaces deployment
+        logger.warning("Running without database connection - some features may be limited")
 
 
 async def close_database():

src/services/connection_pool_service.py

@@ -289,7 +289,10 @@ class ConnectionPoolService:
         
         engine = self._engines.get(pool_name)
         if not engine:
-            raise ValueError(f"Database pool '{pool_name}' not found")
+            # No database available - return None
+            logger.warning(f"Database pool '{pool_name}' not found - running without database")
+            yield None
+            return
         
         # Track wait time
         start_time = time.time()