fix(storage): use escapeshellarg for volume names in shell commands

Add proper shell escaping for persistent volume names when used in
docker volume rm commands. Also add volume name validation pattern
to ValidationPatterns for consistent input checking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Models/Application.php

@@ -390,7 +390,7 @@ class Application extends BaseModel
             }
             $server = data_get($this, 'destination.server');
             foreach ($persistentStorages as $storage) {
-                instant_remote_process(["docker volume rm -f $storage->name"], $server, false);
+                instant_remote_process(['docker volume rm -f '.escapeshellarg($storage->name)], $server, false);
             }
         }
     }