fix(bulk-upload): correct stale DocumentBatchMetadataDTO type in api.ts

Generated type had tags?: string but Java DTO declares List<String> tagNames.
Corrected to tagNames?: string[] to match the backend contract.

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

frontend/src/lib/generated/api.ts

@@ -1695,7 +1695,7 @@ export interface components {
             /** Format: date */
             documentDate?: string;
             location?: string;
-            tags?: string;
+            tagNames?: string[];
             metadataComplete?: boolean;
         };
         QuickUploadResult: {