fix(ci): bump base image to node:22-alpine

corepack-installed pnpm 11 requires node:sqlite (Node 22+).
Build was failing in deps stage with ERR_UNKNOWN_BUILTIN_MODULE.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 # ───────────── 1. deps：安装依赖（含 prisma generate via postinstall） ─────────────
-FROM node:20-alpine AS deps
+FROM node:22-alpine AS deps
 RUN apk add --no-cache libc6-compat openssl
 WORKDIR /app
 
@@ -12,7 +12,7 @@ COPY prisma ./prisma
 RUN pnpm install --frozen-lockfile
 
 # ───────────── 2. builder：Next.js 构建（standalone 产物） ─────────────
-FROM node:20-alpine AS builder
+FROM node:22-alpine AS builder
 RUN apk add --no-cache libc6-compat openssl
 WORKDIR /app
 
@@ -25,7 +25,7 @@ ENV NEXT_TELEMETRY_DISABLED=1
 RUN pnpm build
 
 # ───────────── 3. runner：最小运行时镜像 ─────────────
-FROM node:20-alpine AS runner
+FROM node:22-alpine AS runner
 RUN apk add --no-cache libc6-compat openssl
 WORKDIR /app