feat: 从 SQLite 切换到 PostgreSQL

- Prisma provider 改为 postgresql
- docker-compose 新增 postgres 服务（带健康检查）
- Dockerfile 移除 sqlite3/template.db，改用 npm install prisma 做运行时 schema 同步
- docker-entrypoint.sh 简化为 prisma db push + node server.js

Dockerfile

@@ -17,34 +17,30 @@ COPY . .
 ARG NEXT_PUBLIC_AMAP_API_KEY
 ENV NEXT_PUBLIC_AMAP_API_KEY=${NEXT_PUBLIC_AMAP_API_KEY}
 RUN npx prisma generate
-ENV DATABASE_URL="file:./template.db"
-RUN npx prisma db push
 RUN npm run build
 
 # --- Production ---
 FROM base AS runner
 WORKDIR /app
 ENV NODE_ENV=production
-RUN apk add --no-cache sqlite
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs
 
 COPY --from=builder /app/public ./public
 COPY --from=builder /app/prisma ./prisma
-COPY --from=builder /app/prisma/template.db ./template.db
 
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
 
+# Prisma CLI for automatic schema migration on startup
+RUN npm install prisma --no-save
+
 COPY docker-entrypoint.sh ./
 RUN chmod +x docker-entrypoint.sh
 
-RUN mkdir -p /app/data && chown nextjs:nodejs /app/data
-
 USER nextjs
 EXPOSE 3000
 ENV PORT=3000
 ENV HOSTNAME="0.0.0.0"
-ENV DATABASE_URL="file:/app/data/prod.db"
 
 CMD ["./docker-entrypoint.sh"]