fix(core): Use explicit types in configs to ensure valid decorator metadata (#10433)

packages/@n8n/config/src/configs/external-storage.config.ts

@@ -4,29 +4,29 @@ import { Config, Env, Nested } from '../decorators';
 class S3BucketConfig {
 	/** Name of the n8n bucket in S3-compatible external storage */
 	@Env('N8N_EXTERNAL_STORAGE_S3_BUCKET_NAME')
-	name = '';
+	name: string = '';
 
 	/** Region of the n8n bucket in S3-compatible external storage @example "us-east-1" */
 	@Env('N8N_EXTERNAL_STORAGE_S3_BUCKET_REGION')
-	region = '';
+	region: string = '';
 }
 
 @Config
 class S3CredentialsConfig {
 	/** Access key in S3-compatible external storage */
 	@Env('N8N_EXTERNAL_STORAGE_S3_ACCESS_KEY')
-	accessKey = '';
+	accessKey: string = '';
 
 	/** Access secret in S3-compatible external storage */
 	@Env('N8N_EXTERNAL_STORAGE_S3_ACCESS_SECRET')
-	accessSecret = '';
+	accessSecret: string = '';
 }
 
 @Config
 class S3Config {
 	/** Host of the n8n bucket in S3-compatible external storage @example "s3.us-east-1.amazonaws.com" */
 	@Env('N8N_EXTERNAL_STORAGE_S3_HOST')
-	host = '';
+	host: string = '';
 
 	@Nested
 	bucket: S3BucketConfig;