fix: Update CI/CD pipeline for Next.js

- Updated Gitea workflow to build Next.js instead of Nuxt
- Removed working-directory references to apps/website
- Created Dockerfile for Next.js production builds
- Added standalone output mode to next.config.js for Docker
- Updated build and artifact paths in workflow

🤖 Generated with Claude Code

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

Dockerfile

@@ -0,0 +1,41 @@
+# Build stage
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy all files
+COPY . .
+
+# Build Next.js app
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+
+# Create a non-root user
+RUN addgroup -g 1001 -S nodejs
+RUN adduser -S nextjs -u 1001
+
+# Copy built application
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+# Change ownership
+RUN chown -R nextjs:nodejs /app
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT 3000
+
+CMD ["node", "server.js"]