Fix "address already in use" on server restart (Linux/macOS)

modules/llama_cpp_server.py

@@ -373,6 +373,7 @@ class LlamaServer:
         """Check if a port is available for use."""
         with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
             try:
+                s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                 s.bind(('', port))
                 return True
             except OSError: