feat: Implement image fetching and storage system

- Add image-fetcher module for downloading and saving images from various sources.
- Create storage module for managing image files, including downloading, verifying integrity, and cleaning up orphaned files.
- Develop gallery HTML page for displaying images with sorting and filtering options.
- Set up RESTful API routes for image management, including fetching, adding tags, and deleting images.
- Introduce setup script for initializing the database and configuring image sources.
- Implement a batch process for verifying image integrity and cleaning up old images.
- Add setup batch script for easy installation and configuration of the image storage system.

Dockerfile

@@ -8,8 +8,13 @@ RUN npm install --omit=dev
 
 COPY . .
 
-# Ensure proper permissions for node user
-RUN chown -R node:node /app
+# Create data directory for persistent storage
+RUN mkdir -p /app/data/images && \
+    chown -R node:node /app && \
+    chmod -R 755 /app/data
+
+# Install avahi for mDNS support (.local hostname resolution)
+RUN apk add --no-cache avahi avahi-tools libc6-compat
 
 EXPOSE 3001