Configure for self-hosted deployment

- Add environment variable support for Supabase and Pakasir configurations
- Create Docker configuration with Nginx for production deployment
- Add .env.example with all required environment variables
- Remove hardcoded URLs from Supabase client and Checkout component
- Add Docker and Nginx configuration files for Coolify deployment

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,47 @@
+# Build stage
+FROM node:18-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies (including dev dependencies for build)
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM nginx:alpine AS production
+
+# Copy custom nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Copy built assets from builder stage
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Create non-root user (optional but recommended for security)
+RUN addgroup -g 1001 -S nodejs
+RUN adduser -S nextjs -u 1001
+
+# Change ownership of the nginx directory
+RUN chown -R nextjs:nodejs /usr/share/nginx/html
+RUN chown -R nextjs:nodejs /var/cache/nginx
+RUN chown -R nextjs:nodejs /var/log/nginx
+RUN chown -R nextjs:nodejs /etc/nginx/conf.d
+RUN touch /var/run/nginx.pid
+RUN chown -R nextjs:nodejs /var/run/nginx.pid
+
+# Switch to non-root user
+USER nextjs
+
+# Expose port 80
+EXPOSE 80
+
+# Start nginx
+CMD ["nginx", "-g", "daemon off;"]