Add Docker deployment support for Dokploy

- Add Dockerfile with multi-stage build
- Add docker-compose.yml with Traefik labels
- Add .dockerignore for optimal build context
- Update next.config.ts for standalone output
- Update DEPLOYMENT.md with Dokploy instructions

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

Dockerfile

@@ -0,0 +1,50 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package.json package-lock.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy all source files
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine AS runner
+
+# Set working directory
+WORKDIR /app
+
+# Set environment to production
+ENV NODE_ENV=production
+
+# Create a non-root user
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy necessary files from builder
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+# Change ownership to nextjs user
+RUN chown -R nextjs:nodejs /app
+
+# Switch to nextjs user
+USER nextjs
+
+# Expose port 3000
+EXPOSE 3000
+
+# Set hostname
+ENV HOSTNAME="0.0.0.0"
+
+# Start the application
+CMD ["node", "server.js"]