feat(security): add editable cloud credential pages

Add dedicated show/edit pages for cloud provider tokens and cloud-init
scripts, including descriptions and UUID routes.

Generate private keys directly from the index and surface cloud provider
API loading errors in server creation flows.

app/Models/CloudProviderToken.php

@@ -13,6 +13,7 @@ class CloudProviderToken extends BaseModel
         'provider',
         'token',
         'name',
+        'description',
     ];
 
     protected $hidden = [