Update documentation and CLI behavior for GPU management

- Clarified the behavior of `Ctrl+C` and `Ctrl+D` in the README and other documentation, specifying that `Ctrl+C` only stops the tunnel while keeping the GPU active, and `Ctrl+D` stops the GPU while preserving disk data.
- Enhanced the CLI documentation to reflect these changes, ensuring users understand the implications of these commands during GPU operations.
- Improved the handling of data bindings and remounting logic in the codebase to prevent issues with empty model tabs in the UI.
- Added tests to validate the new command behaviors and ensure proper documentation alignment.

src/gpu_rent/ready.py

@@ -137,7 +137,27 @@ if want_swarm:
     })
 
 if want_ollama:
-    ok, detail = http_ok("http://127.0.0.1:11434/api/tags")
+    try:
+        req = urllib.request.Request("http://127.0.0.1:11434/api/tags", method="GET")
+        with urllib.request.urlopen(req, timeout=5) as resp:
+            raw = resp.read().decode("utf-8", "replace")
+        payload = json.loads(raw)
+        models = payload.get("models") if isinstance(payload, dict) else None
+        names = []
+        if isinstance(models, list):
+            for m in models:
+                if isinstance(m, dict) and m.get("name"):
+                    names.append(str(m["name"]))
+                elif isinstance(m, str) and m.strip():
+                    names.append(m.strip())
+        if names:
+            preview = ", ".join(names[:3])
+            extra = "" if len(names) <= 3 else f" +{len(names) - 3}"
+            ok, detail = True, f"{len(names)} models ({preview}{extra})"
+        else:
+            ok, detail = False, "Ollama up, 0 models — Assistent dropdown empty; ollama pull"
+    except Exception as exc:
+        ok, detail = False, str(exc)[:160]
     checks.append({
         "name": "ollama",
         "ok": ok,