build: 优化 Docker/Workflow 构建，使用 Next.js 环境变量注入版本和构建时间，并移除对 package.json 的硬编码替换

docker/Dockerfile.frontend

@@ -20,6 +20,9 @@ ENV WAVELET_BACKEND_URL=https://build-placeholder-2.invalid
 ARG VERSION=""
 ARG BUILD_DATE=""
 
+ENV NEXT_PUBLIC_APP_VERSION=${VERSION}
+ENV NEXT_PUBLIC_APP_BUILD_DATE=${BUILD_DATE}
+
 WORKDIR /app
 
 COPY frontend/package.json frontend/pnpm-lock.yaml ./
@@ -27,10 +30,6 @@ RUN pnpm install --frozen-lockfile
 
 COPY frontend/ ./
 
-RUN if [ -n "$VERSION" ] || [ -n "$BUILD_DATE" ]; then \
-      VERSION="$VERSION" BUILD_DATE="$BUILD_DATE" node -e "const fs = require('fs'); const pkg = require('./package.json'); const version = process.env.VERSION; const buildDate = process.env.BUILD_DATE; if (version) pkg.version = version; if (buildDate) pkg.buildDate = buildDate; fs.writeFileSync('./package.json', JSON.stringify(pkg, null, 2) + '\\n')"; \
-    fi
-
 RUN pnpm build
 
 RUN grep -rl \