Adapt for self-hosted deployment on Coolify

- Replace @vercel/postgres with standard pg library
- Add Dockerfile for Next.js standalone build
- Add tsconfig.json, postcss.config.js
- Fix globals.css undefined tailwind utilities
- Force dynamic rendering for DB-dependent pages
- Add .dockerignore

Dockerfile

@@ -0,0 +1,47 @@
+FROM node:18-alpine AS base
+
+# Install dependencies only when needed
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+COPY frontend/package.json frontend/package-lock.json* ./
+RUN npm ci 2>/dev/null || npm install
+
+# Build the application
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY frontend/ .
+
+# Need DATABASE_URL at build time for Next.js static generation (can be dummy)
+ARG DATABASE_URL=postgresql://localhost/burmddit
+ENV DATABASE_URL=${DATABASE_URL}
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN npm run build
+
+# Production image
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy public assets
+COPY --from=builder /app/public ./public
+
+# Copy standalone build
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]