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.

src/gpu_rent/remote/tune_swarm_perf.py

@@ -129,11 +129,15 @@ def main() -> int:
             prev = json.loads(MARKER.read_text(encoding="utf-8"))
         except json.JSONDecodeError:
             prev = {}
-    if prev.get("uuid") and prev.get("uuid") == plan["uuid"] and prev.get("extra_args") == plan["extra_args"]:
+    same_gpu = bool(prev.get("uuid") and prev.get("uuid") == plan["uuid"])
+    if same_gpu and prev.get("extra_args") == plan["extra_args"]:
         if prev.get("pip_ok") or not plan["use_sage"]:
             print(f"perf tune already applied for {plan['name']} ({plan['tier']})")
             return 0
 
+    if same_gpu and plan["use_sage"] and prev.get("pip_ok") is False:
+        print("perf tune: retry (previous pip_ok=false — sage/triton ещё не встали)")
+
     print(f"perf tune: {plan['name']} tier={plan['tier']} sage={plan['use_sage']}")
     pip_ok = not plan["use_sage"]
     restarted_needed = False