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/access_card.py

@@ -161,8 +161,12 @@ def render_access_panel(
         notes = load_state().notes or {}
         if notes.get("idle_killer") == "failed":
             warn_bits.append(
-                "idle-killer НЕ вооружён — GPU может крутиться без авто-stop"
+                "idle-killer НЕ вооружён — GPU может крутиться без авто-stop → gpu-rent stop"
             )
+        if notes.get("stack_vm_error"):
+            warn_bits.append(f"стек VM: {str(notes['stack_vm_error'])[:140]}")
+        if notes.get("gpu_env_error"):
+            warn_bits.append(f"GPU-стек: {str(notes['gpu_env_error'])[:140]}")
         if notes.get("llm_error"):
             warn_bits.append(f"LLM ошибка: {str(notes['llm_error'])[:120]}")
     except Exception:
@@ -170,8 +174,9 @@ def render_access_panel(
 
     parts: list = [subtitle, Text("")]
     if warn_bits:
+        parts.append(Text("⚠ ВНИМАНИЕ — биллинг / готовность", style="bold white on red"))
         for w in warn_bits:
-            parts.append(Text(f"⚠ {w}", style="bold red"))
+            parts.append(Text(f"  • {w}", style="bold red"))
         parts.append(Text(""))
     parts.extend(
         [
@@ -185,10 +190,11 @@ def render_access_panel(
         ]
     )
     body = Group(*parts)
+    border = "red" if warn_bits else "bright_blue"
     return Panel(
         body,
         title=f"[bold]{title}[/bold]",
-        border_style="bright_blue",
+        border_style=border,
         padding=(1, 2),
     )
 
@@ -212,6 +218,16 @@ def print_access_card(
         # Plain fallback for non-Rich loggers
         log("")
         log("══ gpu-rent · доступы ══")
+        try:
+            notes = load_state().notes or {}
+            if notes.get("idle_killer") == "failed":
+                log("⚠ idle-killer НЕ вооружён — GPU без авто-stop → gpu-rent stop")
+            if notes.get("stack_vm_error"):
+                log(f"⚠ стек VM: {notes['stack_vm_error']}")
+            if notes.get("gpu_env_error"):
+                log(f"⚠ GPU-стек: {notes['gpu_env_error']}")
+        except Exception:
+            pass
         for link in collect_access_links(cfg, tunneled=tunneled):
             extra = f"  ({link.note})" if link.note else ""
             log(f"  {link.label:14} {link.url}{extra}")