Fix critical issues: gallery authentication and photo duplication

- Fix gallery-specific authentication for images
  - Update AuthenticatedImage component to use gallery-specific tokens
  - Add isGallery prop to distinguish between admin and gallery contexts
  - Update PhotoGrid and PhotoLightbox to pass isGallery prop

- Fix photo duplication issue in fileWatcher service
  - Add check to prevent duplicate photo entries when backend restarts
  - File watcher now verifies if photo exists before inserting
  - Cleaned up 176 duplicate photos from database

These fixes resolve:
1. Gallery images not loading due to auth token errors
2. Photo count increasing without new uploads due to duplicates

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

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

backend/src/services/fileWatcher.js

@@ -63,17 +63,26 @@ async function processNewPhoto(filePath) {
   // Calculate relative thumbnail path
   const relativeThumbPath = thumbnailPath; // thumbnailPath is already relative to storage root
   
-  // Add to database
-  await db('photos').insert({
-    event_id: event.id,
-    filename: path.basename(filePath),
-    path: relativePath,
-    thumbnail_path: relativeThumbPath,
-    type: photoType,
-    size_bytes: stats.size
-  });
+  // Check if photo already exists
+  const existingPhoto = await db('photos')
+    .where({ event_id: event.id, filename: path.basename(filePath) })
+    .first();
   
-  logger.info(`Added new photo: ${relativePath}`);
+  if (!existingPhoto) {
+    // Add to database
+    await db('photos').insert({
+      event_id: event.id,
+      filename: path.basename(filePath),
+      path: relativePath,
+      thumbnail_path: relativeThumbPath,
+      type: photoType,
+      size_bytes: stats.size
+    });
+    
+    logger.info(`Added new photo: ${relativePath}`);
+  } else {
+    logger.debug(`Photo already exists: ${relativePath}`);
+  }
 }
 
 async function removePhoto(filePath) {

frontend/src/components/common/AuthenticatedImage.tsx

@@ -5,6 +5,7 @@ interface AuthenticatedImageProps extends React.ImgHTMLAttributes<HTMLImageEleme
   src: string;
   fallbackSrc?: string;
   useWatermark?: boolean;
+  isGallery?: boolean;
 }
 
 export const AuthenticatedImage: React.FC<AuthenticatedImageProps> = ({
@@ -12,6 +13,7 @@ export const AuthenticatedImage: React.FC<AuthenticatedImageProps> = ({
   fallbackSrc,
   alt,
   useWatermark = false,
+  isGallery = false,
   ...props
 }) => {
   const [imageSrc, setImageSrc] = useState<string>('');
@@ -21,7 +23,20 @@ export const AuthenticatedImage: React.FC<AuthenticatedImageProps> = ({
   useEffect(() => {
     let objectUrl: string | null = null;
 
-    const token = getAuthToken();
+    // Determine which token to use based on context
+    let token: string | undefined;
+    
+    if (isGallery) {
+      // For gallery images, get the gallery-specific token
+      const pathParts = window.location.pathname.split('/');
+      if (pathParts[1] === 'gallery' && pathParts[2]) {
+        const gallerySlug = pathParts[2];
+        token = localStorage.getItem(`gallery_token_${gallerySlug}`) || undefined;
+      }
+    } else {
+      // For admin images, use the admin token
+      token = getAuthToken(true);
+    }
     
     if (!src) {
       setImageSrc(fallbackSrc || '');
@@ -89,7 +104,7 @@ export const AuthenticatedImage: React.FC<AuthenticatedImageProps> = ({
         URL.revokeObjectURL(objectUrl);
       }
     };
-  }, [src, fallbackSrc, useWatermark]);
+  }, [src, fallbackSrc, useWatermark, isGallery]);
 
   if (isLoading) {
     return (

frontend/src/components/gallery/PhotoGrid.tsx

@@ -237,6 +237,7 @@ const PhotoThumbnail: React.FC<PhotoThumbnailProps> = ({
             alt={photo.filename}
             className="w-full h-full object-cover rounded-lg transition-transform duration-200 group-hover:scale-105"
             loading="lazy"
+            isGallery={true}
           />
           
           {/* Overlay on hover */}

frontend/src/components/gallery/PhotoLightbox.tsx

@@ -252,6 +252,7 @@ export const PhotoLightbox: React.FC<PhotoLightboxProps> = ({
           }}
           draggable={false}
           useWatermark={true}
+          isGallery={true}
         />
       </div>