fix: rich-text-editor upload endpoint 404

The Jodit uploader was posting to /files but the backend route is
/api/v1.0/file/upload (auto-mounted from controllers/api/v1.0/file/
upload.ts). This caused a 404 when uploading images from the editor.

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src/components/admin/rich-text-editor.tsx

@@ -325,7 +325,7 @@ export function AdminRichTextEditor({
       language: "vi",
       toolbarButtonSize: "middle",
       uploader: {
-        url: `${links.apiEndpoint}/files`,
+        url: `${links.apiEndpoint}/api/v1.0/file/upload`,
         method: "POST",
         headers: {
           ...(accessToken ? { Authorization: `Bearer ${accessToken}` } : {}),