Enhance SwarmUI integration and GPU environment verification

- Updated CLI documentation to reflect the new handling of `CIVITAI_API_TOKEN`, which is now automatically passed to SwarmUI user settings during startup.
- Improved the `render_access_panel` function to include additional warnings for idle-killer failures and stack errors, enhancing user feedback.
- Introduced a new function `seed_swarmui_api_keys` to manage API key injection into SwarmUI, ensuring seamless integration with the Model Downloader.
- Enhanced GPU environment verification logic to include fail-fast checks for critical components like CUDA, improving error handling and user notifications.
- Updated tests to validate the new API key handling and access panel behavior, ensuring robustness in the integration process.

docs/setup.md

@@ -169,6 +169,7 @@ notepad .env
 2. [Account settings](https://civitai.com/user/account) → **API Keys** → **Add**.
 3. Токен показывают **один раз** → в `.env`: `CIVITAI_API_TOKEN=...`
 4. Хост по умолчанию **`civitai.red`** (полный каталог). С `.com` NSFW часто 404.
+5. На `up` токен уходит и в seed на VM, и в SwarmUI User Settings (Civitai API Key) — вручную в UI вводить не нужно.
 5. Манифест:
 
 ```powershell