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.

tests/test_tune_swarm_perf.py

@@ -86,3 +86,50 @@ def test_pip_ok_patches_extra_args(tmp_path, monkeypatch):
     assert marker["pip_ok"] is True
     assert "--use-sage-attention" in marker["extra_args"]
     assert "--use-sage-attention" in backends.read_text(encoding="utf-8")
+
+
+def test_pip_fail_retries_next_run(tmp_path, monkeypatch):
+    mod = _load()
+    data = tmp_path
+    backends = data / "Data" / "Backends.fds"
+    backends.parent.mkdir(parents=True)
+    backends.write_text("ExtraArgs: \n", encoding="utf-8")
+    gpu_json = data / ".gpu-rent-gpu.json"
+    gpu_json.write_text(
+        json.dumps(
+            {
+                "vram_mib": 24576,
+                "compute_cap": "8.9",
+                "uuid": "gpu-1",
+                "name": "RTX",
+            }
+        ),
+        encoding="utf-8",
+    )
+    marker = data / ".gpu-rent-perf-tuned"
+    marker.write_text(
+        json.dumps(
+            {
+                "uuid": "gpu-1",
+                "extra_args": "",
+                "pip_ok": False,
+                "tier": "high",
+                "name": "RTX",
+            }
+        ),
+        encoding="utf-8",
+    )
+    pip = data / "fake-pip"
+    pip.write_text("#!/bin/sh\n", encoding="utf-8")
+
+    monkeypatch.setattr(mod, "DATA", data)
+    monkeypatch.setattr(mod, "GPU_JSON", gpu_json)
+    monkeypatch.setattr(mod, "MARKER", marker)
+    monkeypatch.setattr(mod, "BACKENDS", backends)
+    monkeypatch.setattr(mod, "find_pip", lambda: pip)
+    monkeypatch.setattr(mod, "pip_install_sage", lambda _p: True)
+
+    assert mod.main() == 0
+    new_m = json.loads(marker.read_text(encoding="utf-8"))
+    assert new_m["pip_ok"] is True
+    assert "--use-sage-attention" in backends.read_text(encoding="utf-8")