fix(ai): resolve PROVIDERS undefined in profileModalController (agent)

Import `PROVIDERS` from `../services/storageService.js` in `js/ui/profileModalController.js`.
This fixes a `ReferenceError` when testing or saving generic S3 storage configurations.
The error was caused by using `PROVIDERS.GENERIC` without importing the constant.

js/ui/profileModalController.js

@@ -38,6 +38,7 @@ import {
   uploadAttachment,
   getAttachmentCacheStats,
 } from "../services/attachmentService.js";
+import { PROVIDERS } from "../services/storageService.js";
 import {
   getLinkPreviewSettings,
   setLinkPreviewAutoFetch,