feat: migrate payment provider to easy-pay, add order history and refund support

- Replace zpay with easy-pay payment provider (new lib/easy-pay/ module)
- Add order history page for users (pay/orders)
- Add GET /api/orders/my endpoint to list user's own orders
- Add GET /api/users/[id] endpoint for sub2api user lookup
- Add order status tracking module (lib/order/status.ts)
- Update config to support easy-pay credentials (merchant ID, key, gateway)
- Update PaymentForm and PaymentQRCode components for easy-pay flow
- Update pay page and admin page with new order management UI
- Update order service to support easy-pay, cancellation, and refund

Dockerfile

@@ -0,0 +1,34 @@
+FROM node:22-alpine AS base
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+FROM base AS deps
+WORKDIR /app
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+RUN pnpm install --frozen-lockfile
+
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN pnpm prisma generate
+RUN pnpm build
+
+FROM node:22-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+RUN addgroup --system --gid 1001 nodejs && 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/node_modules/@prisma ./node_modules/@prisma
+COPY --from=builder /app/node_modules/.pnpm ./node_modules/.pnpm
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/prisma.config.ts ./prisma.config.ts
+COPY --from=builder /app/start.sh ./start.sh
+RUN chmod +x start.sh && \
+    PRISMA_PKG=$(find node_modules/.pnpm -path '*/prisma/build/index.js' -type f | head -1 | sed 's|/build/index.js||') && \
+    ln -s /app/$PRISMA_PKG node_modules/prisma
+USER nextjs
+EXPOSE 3000
+ENV PORT=3000
+CMD ["./start.sh"]