feat: implement feedback filter for liked/favorited photos (Issue #17)

Implemented Feature Request 1 from github.com/the-luap/picpeak/issues/17:
- Added filter functionality to display only liked or favorited photos
- Integrated feedback filter directly into PhotoFilterBar component
- Implemented responsive design with proper mobile/tablet/desktop layouts
- Filter only shows when feedback is enabled for the gallery
- Added proper count display for liked and favorited photos

Improvements:
- Fixed responsive breakpoints (mobile <768px, tablet 768-1023px, desktop ≥1024px)
- Feedback filter shows inline with categories on desktop with vertical divider
- On mobile/tablet, filter appears below categories to prevent layout issues
- Added horizontal scrolling for category buttons to prevent cut-off

Code cleanup:
- Removed all debug console.log statements from production code
- Removed test route from backend gallery.js
- Cleaned up unnecessary logging in frontend components

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/src/services/gallery.service.ts

@@ -16,8 +16,13 @@ export const galleryService = {
   },
 
   // Get gallery photos (requires auth)
-  async getGalleryPhotos(slug: string): Promise<GalleryData> {
-    const response = await api.get<GalleryData>(`/gallery/${slug}/photos`);
+  async getGalleryPhotos(slug: string, filter?: 'liked' | 'favorited' | 'all', guestId?: string): Promise<GalleryData> {
+    const params: any = {};
+    if (filter && filter !== 'all' && guestId) {
+      params.filter = filter;
+      params.guest_id = guestId;
+    }
+    const response = await api.get<GalleryData>(`/gallery/${slug}/photos`, { params });
     return response.data;
   },