Fix worker communication initialization

- Update workers to use proper socket path from config instead of hardcoded paths
- Ensure workers check communication type and use appropriate connection method
- Fix SocketCommunicator to properly handle Unix socket paths
- Revert database default back to 'unix' for proper Unix socket support

vidai/worker_analysis.py

@@ -176,7 +176,8 @@ def worker_process(backend_type: str):
 
     comm_type = get_comm_type()
     if comm_type == 'unix':
-        comm = SocketCommunicator(socket_path='/tmp/vidai_workers.sock', comm_type='unix')
+        from .compat import get_socket_path
+        comm = SocketCommunicator(socket_path=get_socket_path('worker'), comm_type='unix')
     else:
         from .config import get_backend_worker_port
         comm = SocketCommunicator(host='localhost', port=get_backend_worker_port(), comm_type='tcp')

vidai/worker_training.py

@@ -49,7 +49,8 @@ def worker_process(backend_type: str):
 
     comm_type = get_comm_type()
     if comm_type == 'unix':
-        comm = SocketCommunicator(socket_path='/tmp/vidai_workers.sock', comm_type='unix')
+        from .compat import get_socket_path
+        comm = SocketCommunicator(socket_path=get_socket_path('worker'), comm_type='unix')
     else:
         from .config import get_backend_worker_port
         comm = SocketCommunicator(host='localhost', port=get_backend_worker_port(), comm_type='tcp')