Enhance installation state management and diagnostics for ComfyUI

- Updated the `gpu-rent` logic to ensure the `IsInstalled` flag is accurately set based on the presence of ComfyUI, preventing conflicts during installation.
- Improved the handling of the `/mnt/swarm_data` directory to skip creation if it does not exist, enhancing robustness in provisioning.
- Added tests to validate the new installation state checks and ensure proper diagnostics during the installation process, including scenarios for clearing and setting the `IsInstalled` flag.

src/gpu_rent/provision.py

@@ -490,6 +490,9 @@ for p in uniq:
                 continue
             if "/mnt/swarm_data/" not in str(p):
                 continue
+            if not Path("/mnt/swarm_data").is_dir():
+                print(f"skip create {p}: /mnt/swarm_data нет")
+                continue
             p.parent.mkdir(parents=True, exist_ok=True)
             p.write_text(
                 "IsInstalled: true\n"