`deno task build` SSG 构建失败 — `@lessjs/core/ssr-handler` 模块未找到

[SisyphusZheng]

严重级别：🔴 P0 — 阻断性，生产构建完全无法使用

影响版本：v0.10.0

复现步骤：

1. 使用 v0.10.0 的 deno.json
2. deno task build

期望行为：SSG 构建成功，输出静态 HTML 到 dist/

实际行为：Phase 3 (SSG) 失败：

Error: [vite]: Rolldown failed to resolve import "@lessjs/core/ssr-handler" from " virtual:less-ssg-entry".
This is most likely unintended because it can break your application at runtime.
If you do want to externalize this module explicitly add it to `build.rollupOptions.external`

根因分析：virtual:less-ssg-entry 虚拟模块尝试 import ... from '@lessjs/core/ssr-handler'，但 @lessjs/core@0.10.0 的 JSR 包未导出 ssr-handler 这个子路径。可能是 v0.10.0 重构 SSR 架构（ADR 0008-0014）时遗漏了该导出。

完整错误链：

SsrRenderError [LessError]: SSR render failed: SSG pipeline
  cause: Build failed with 1 error:
  Error: Rolldown failed to resolve import "@lessjs/core/ssr-handler" from " virtual:less-ssg-entry"

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