feat: initial NFC Attendance Hub implementation

- Multi-tenant client management with unique API keys
- Semaphore SMS integration (per-client key + sender name + credit balance)
- DB-based SMS queue with 3-attempt retry and exponential backoff
- Failed SMS dashboard with manual retry button
- Reports page with date/client filter and CSV export
- Admin auth via NextAuth (email/password)
- Docker Compose setup (app + PostgreSQL 16)
- Prisma 5 schema with SmsQueue, SmsLog, Client, User models

Tech: Next.js 14 App Router + TypeScript + Tailwind CSS + Prisma + PostgreSQL

Dockerfile

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+FROM node:20-alpine AS base
+
+# Install dependencies only when needed
+FROM base AS deps
+RUN apk add --no-cache libc6-compat openssl
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# Rebuild the source code only when needed
+FROM base AS builder
+RUN apk add --no-cache openssl
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+ENV NEXT_TELEMETRY_DISABLED 1
+ENV DATABASE_URL="postgresql://placeholder:placeholder@placeholder:5432/placeholder"
+
+RUN npx prisma generate
+RUN npm run build
+
+# Production image
+FROM base AS runner
+RUN apk add --no-cache openssl
+WORKDIR /app
+
+ENV NODE_ENV production
+ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/node_modules/.prisma ./node_modules/.prisma
+COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma
+
+# Entrypoint script
+COPY --chown=nextjs:nodejs docker-entrypoint.sh ./
+RUN chmod +x docker-entrypoint.sh
+
+USER nextjs
+
+EXPOSE 3000
+ENV PORT 3000
+ENV HOSTNAME "0.0.0.0"
+
+ENTRYPOINT ["./docker-entrypoint.sh"]
+CMD ["node", "server.js"]