feat(ComboWidget): add ability to have mapped inputs (#6585)

## Summary

1. Add a `getOptionLabel` option to `ComboWidget` so users of it can map
of custom labels to widget values. (e.g., `"My Photo" ->
"my_photo_1235.png"`).
2. Utilize this ability in Cloud environment to map user uploaded
filenames to their corresponding input asset.
3. Copious unit tests to make sure I didn't (AFAIK) break anything
during the refactoring portion of development.
4. Bonus: Scope model browser to only show in cloud distributions until
it's released elsewhere; should prevent some undesired UI behavior if a
user accidentally enables the assetAPI.

## Review Focus

Widget code: please double check the work there.

## Screenshots (if applicable)



https://github.com/user-attachments/assets/a94b3203-c87f-4285-b692-479996859a5a


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6585-Feat-input-mapping-2a26d73d365081faa667e49892c8d45a)
by [Unito](https://www.unito.io)

src/platform/assets/services/assetService.ts

@@ -194,20 +194,31 @@ function createAssetService() {
   /**
    * Gets assets filtered by a specific tag
    *
-   * @param tag - The tag to filter by (e.g., 'models')
+   * @param tag - The tag to filter by (e.g., 'models', 'input')
    * @param includePublic - Whether to include public assets (default: true)
+   * @param options - Pagination options
+   * @param options.limit - Maximum number of assets to return (default: 500)
+   * @param options.offset - Number of assets to skip (default: 0)
    * @returns Promise<AssetItem[]> - Full asset objects filtered by tag, excluding missing assets
    */
   async function getAssetsByTag(
     tag: string,
-    includePublic: boolean = true
+    includePublic: boolean = true,
+    {
+      limit = DEFAULT_LIMIT,
+      offset = 0
+    }: { limit?: number; offset?: number } = {}
   ): Promise<AssetItem[]> {
     const queryParams = new URLSearchParams({
       include_tags: tag,
-      limit: DEFAULT_LIMIT.toString(),
+      limit: limit.toString(),
       include_public: includePublic ? 'true' : 'false'
     })
 
+    if (offset > 0) {
+      queryParams.set('offset', offset.toString())
+    }
+
     const data = await handleAssetRequest(
       `${ASSETS_ENDPOINT}?${queryParams.toString()}`,
       `assets for tag ${tag}`