fix: TypeScript strict mode errors in server and services

api/services/hetzner.ts

@@ -64,7 +64,7 @@ async function hetznerRequest<T>(endpoint: string): Promise<T> {
     throw new Error(`Hetzner API error: ${response.status} ${response.statusText}`)
   }
 
-  return response.json()
+  return response.json() as Promise<T>
 }
 
 // Sincronizar lista de servidores