fix: resolve lint errors from ACL/admin implementation

- Remove unused requireOwnerOrAdmin import from videos.ts
- Remove unused requireAuth import from users.ts
- Remove unused GraphQLError import from articles.ts
- Replace URLSearchParams with SvelteURLSearchParams in admin users page
- Apply prettier formatting to all changed files

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

packages/frontend/src/routes/admin/videos/+page.svelte

@@ -87,8 +87,7 @@
                   >
                 {/if}
                 {#if video.featured}
-                  <span
-                    class="px-1.5 py-0.5 rounded text-xs font-medium bg-primary/10 text-primary"
+                  <span class="px-1.5 py-0.5 rounded text-xs font-medium bg-primary/10 text-primary"
                     >Featured</span
                   >
                 {/if}