fix: name the guest in VM/CT health alerts, refresh AI models, propose the recipe's volume choice

- A health problem of a VM or CT names the guest in its title and in the
  Quiet Hours summary; a recovery shows its category by name in the
  reader's language.
- AI model lists reviewed against each provider: Gemini adds 3.6/3.7/3.8
  Flash, Groq adds gpt-oss-120b, and Groq/OpenRouter models no longer
  served are removed.
- OCI installer proposes the volume choice the recipe declares, so a path
  meant for a host directory is proposed as one; Duplicati /source is
  proposed on a host directory.

oci/catalog/overlays/duplicati.json

@@ -58,6 +58,56 @@
         "prompt": "Password of the Duplicati web interface",
         "source": "linuxserver-compose"
       }
+    ],
+    "volumes": [
+      {
+        "id": "volume-0",
+        "container_path": "/config",
+        "compose_source_example": "/path/to/duplicati/config",
+        "read_only": false,
+        "required": true,
+        "installation_choice": [
+          "managed-volume",
+          "host-bind"
+        ],
+        "default": "managed-volume",
+        "managed_volume": {
+          "backup": true,
+          "default_size_gb": 4
+        }
+      },
+      {
+        "id": "volume-1",
+        "container_path": "/backups",
+        "compose_source_example": "/path/to/backups",
+        "read_only": false,
+        "required": true,
+        "installation_choice": [
+          "managed-volume",
+          "host-bind"
+        ],
+        "default": "managed-volume",
+        "managed_volume": {
+          "backup": true,
+          "default_size_gb": 8
+        }
+      },
+      {
+        "id": "volume-2",
+        "container_path": "/source",
+        "compose_source_example": "/path/to/source",
+        "read_only": false,
+        "required": true,
+        "installation_choice": [
+          "managed-volume",
+          "host-bind"
+        ],
+        "default": "host-bind",
+        "managed_volume": {
+          "backup": true,
+          "default_size_gb": 8
+        }
+      }
     ]
   },
   "proxmox": {