Initial commit: STL Storage Application

- Complete web-based STL file storage and 3D viewer
- Express.js backend with SQLite database
- Interactive Three.js 3D viewer with orbit controls
- File upload with drag-and-drop support
- Security features: rate limiting, input validation, helmet
- Container deployment with Docker/Podman
- Production-ready configuration management
- Comprehensive logging and monitoring

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

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

Dockerfile

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+FROM node:18-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Create app user for security
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S stlapp -u 1001
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production && npm cache clean --force
+
+# Copy application code
+COPY . .
+
+# Create necessary directories and set permissions
+RUN mkdir -p uploads/stl uploads/thumbnails logs data config && \
+    chown -R stlapp:nodejs /app && \
+    chmod -R 755 /app
+
+# Switch to non-root user
+USER stlapp
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:3000/api/files', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) }).on('error', () => process.exit(1))"
+
+# Start the application
+CMD ["sh", "-c", "test -f stl_storage.db || node init-db.js; node server.js"]