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/bootstrap.sh

@@ -77,9 +77,21 @@ ensure_bind() {
 }
 
 log "пакеты (без upgrade ядра)"
-if [[ "${GPU_RENT_BOOTSTRAP_LIGHT:-0}" == "1" && -f "$MARKER_BOOT" ]]; then
-  log "light bootstrap — пропускаем apt-get"
+# Light: skip apt when Swarm already bootstrapped, or llm-only data disk already ready.
+_light_ok=0
+if [[ "${GPU_RENT_BOOTSTRAP_LIGHT:-0}" == "1" ]]; then
+  if [[ -f "$MARKER_BOOT" ]]; then
+    _light_ok=1
+  elif [[ "${GPU_RENT_SKIP_SWARMUI:-0}" == "1" && -f "$MARKER_DATA" ]]; then
+    _light_ok=1
+  fi
+fi
+if [[ "$_light_ok" == "1" ]]; then
+  log "light bootstrap — пропускаем apt-get (маркер уже есть)"
 else
+  if [[ "${GPU_RENT_BOOTSTRAP_LIGHT:-0}" == "1" ]]; then
+    log "light запрошен, но маркера нет — полный apt"
+  fi
   apt-get update -qq
   apt-get install -y -qq git python3 python3-venv python3-pip python3-full curl ca-certificates
 fi