Add NextSnap PWA with photo gallery viewer and continuous capture

Offline-first photo capture app for Nextcloud with:
- Camera capture with continuous mode (auto-reopens after each photo)
- File browser with fullscreen image gallery, swipe navigation, and rename
- Upload queue with background sync engine
- Admin panel for Nextcloud user management
- Service worker for offline-first caching (v13)

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

setup.sh

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+#!/bin/bash
+# NextSnap Setup Script
+
+set -e
+
+echo "NextSnap Setup"
+echo "=============="
+echo ""
+
+# Check if .env exists
+if [ -f .env ]; then
+    echo "✓ .env file already exists"
+    read -p "Do you want to overwrite it? (y/N) " -n 1 -r
+    echo ""
+    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+        echo "Keeping existing .env file"
+        exit 0
+    fi
+fi
+
+# Copy .env.example
+cp .env.example .env
+echo "✓ Created .env file"
+
+# Generate secret key
+SECRET_KEY=$(python3 -c "import secrets; print(secrets.token_hex(32))")
+sed -i "s/your-secret-key-here/$SECRET_KEY/" .env
+echo "✓ Generated SECRET_KEY"
+
+# Get Nextcloud URL
+read -p "Enter your Nextcloud URL (e.g., https://cloud.example.com): " NEXTCLOUD_URL
+if [ -n "$NEXTCLOUD_URL" ]; then
+    sed -i "s|https://nextcloud.example.com|$NEXTCLOUD_URL|" .env
+    echo "✓ Set NEXTCLOUD_URL"
+fi
+
+# Get port
+read -p "Enter port to expose (default: 8000): " PORT
+if [ -n "$PORT" ]; then
+    sed -i "s/PORT=8000/PORT=$PORT/" .env
+    echo "✓ Set PORT"
+fi
+
+echo ""
+echo "Setup complete! Configuration saved to .env"
+echo ""
+echo "Next steps:"
+echo "  1. Review and adjust .env if needed"
+echo "  2. Run: make build"
+echo "  3. Run: make up"
+echo "  4. Visit: http://localhost:${PORT:-8000}"
+echo ""
+echo "For production deployment, see DEPLOYMENT.md"