chore(fonts): 字体二进制不入库，改用脚本生成

- 远程仓库对单次推送体积有限制，6.7 MB 字体无法一次推送，先从版本库移除
- 新增 tools/build-fonts.py：下载官方分包、合并并子集化，一条命令重建
- @font-face 保留，字体缺失时回退系统字体；离线用例改为按可用性断言

frontend/e2e/dashboard.spec.ts

@@ -222,7 +222,7 @@ test('cancels a running task from the log drawer', async ({
   await expect(drawer.locator('.status-cancelled').first()).toBeVisible()
 })
 
-test('renders fully offline with bundled fonts', async ({ page }) => {
+test('renders without external network access', async ({ page }) => {
   const blocked: string[] = []
   await page.route('**/*', (route) => {
     const url = route.request().url()
@@ -241,19 +241,24 @@ test('renders fully offline with bundled fonts', async ({ page }) => {
   await page.goto('/')
   await expect(page.getByRole('heading', { name: 'TaskPilot' })).toBeVisible()
 
-  const fonts = await page.evaluate(async () => {
+  const state = await page.evaluate(async () => {
+    // 字体二进制不入库；未生成时应回退系统字体，而不是报错。
+    const probe = await fetch('/fonts/LXGWWenKai-Regular.woff2', {
+      method: 'HEAD',
+    })
     await document.fonts.ready
     return {
-      wenkai: document.fonts.check('14px "LXGW WenKai"'),
-      display: document.fonts.check('500 26px "Outfit-Medium"'),
-      loaded: Array.from(document.fonts).map((face) => face.family),
+      wenkaiAvailable: probe.ok,
+      wenkaiLoaded: document.fonts.check('14px "LXGW WenKai"'),
+      displayLoaded: document.fonts.check('500 26px "Outfit-Medium"'),
     }
   })
 
   expect(blocked).toEqual([])
-  expect(fonts.wenkai).toBe(true)
-  expect(fonts.display).toBe(true)
-  expect(fonts.loaded).toContain('LXGW WenKai')
+  expect(state.displayLoaded).toBe(true)
+  if (state.wenkaiAvailable) {
+    expect(state.wenkaiLoaded).toBe(true)
+  }
   await page.screenshot({
     path: 'test-results/dashboard-offline.png',
     fullPage: true,

frontend/index.html

@@ -7,13 +7,6 @@
       name="description"
       content="TaskPilot - Windows 本地定时任务管理平台"
     />
-    <link
-      rel="preload"
-      href="/fonts/LXGWWenKai-Regular.woff2"
-      as="font"
-      type="font/woff2"
-      crossorigin
-    />
     <link
       rel="preload"
       href="/fonts/Outfit-Medium.ttf"