Add __main__.py for direct module execution

src/dolibarr_mcp/__main__.py

@@ -0,0 +1,17 @@
+"""Main entry point for Dolibarr MCP server."""
+
+import sys
+import asyncio
+
+from .dolibarr_mcp_server import main
+
+
+if __name__ == "__main__":
+    try:
+        asyncio.run(main())
+    except KeyboardInterrupt:
+        print("\n👋 Server stopped by user", file=sys.stderr)
+        sys.exit(0)
+    except Exception as e:
+        print(f"❌ Server error: {e}", file=sys.stderr)
+        sys.exit(1)