feat(extension): 浏览器插件 P1 MVP

新建 BillNote_extension/ 工作空间（基于 vitesse-webext 骨架，Vue 3 + Vite + UnoCSS + MV3）。

P1 MVP 范围：
- popup：自动读当前 tab URL，识别 Bilibili / YouTube / 抖音 / 快手；提交 /generate_note 后轮询 /task_status；展示 markdown，复制 + 下载 .md
- options：后端地址输入与连通性测试；从 /get_all_providers + /get_models_by_provider 拉供应商/模型列表；默认画质、截图/跳转、笔记风格
- chrome.storage.local 持久化设置与最近 30 个任务，popup 重开恢复进行中任务
- markdown 里的 /static/screenshots 路径在渲染前重写为绝对地址

后端：CORS 改用 regex，新增允许 chrome-extension:// 与 moz-extension:// 源（同时保留 localhost / 127.0.0.1 / tauri.localhost）。无新增 backend endpoint。

P2-P4（content script 悬浮按钮、cookie 直通、side panel、思维导图、RAG 问答）保留 stub 文件，不在本次范围。

去掉 vitesse-webext 自带的 simple-git-hooks postinstall 配置——它会在仓库根装 pre-commit 钩子去跑 pnpm lint-staged，但仓库根没有 package.json，会破坏所有提交流。

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

BillNote_extension/e2e/basic.spec.ts

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+import { expect, isDevArtifact, name, test } from './fixtures'
+
+test('example test', async ({ page }, testInfo) => {
+  testInfo.skip(!isDevArtifact(), 'contentScript is in closed ShadowRoot mode')
+
+  await page.goto('https://example.com')
+
+  await page.locator(`#${name} button`).click()
+  await expect(page.locator(`#${name} h1`)).toHaveText('Vitesse WebExt')
+})
+
+test('popup page', async ({ page, extensionId }) => {
+  await page.goto(`chrome-extension://${extensionId}/dist/popup/index.html`)
+  await expect(page.locator('button')).toHaveText('Open Options')
+})
+
+test('options page', async ({ page, extensionId }) => {
+  await page.goto(`chrome-extension://${extensionId}/dist/options/index.html`)
+  await expect(page.locator('img')).toHaveAttribute('alt', 'extension icon')
+})

BillNote_extension/e2e/fixtures.ts

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+import path from 'node:path'
+import { setTimeout as sleep } from 'node:timers/promises'
+import fs from 'fs-extra'
+import { type BrowserContext, test as base, chromium } from '@playwright/test'
+import type { Manifest } from 'webextension-polyfill'
+
+export { name } from '../package.json'
+
+export const extensionPath = path.join(__dirname, '../extension')
+
+export const test = base.extend<{
+  context: BrowserContext
+  extensionId: string
+}>({
+  context: async ({ headless }, use) => {
+    // workaround for the Vite server has started but contentScript is not yet.
+    await sleep(1000)
+    const context = await chromium.launchPersistentContext('', {
+      headless,
+      args: [
+        ...(headless ? ['--headless=new'] : []),
+        `--disable-extensions-except=${extensionPath}`,
+        `--load-extension=${extensionPath}`,
+      ],
+    })
+    await use(context)
+    await context.close()
+  },
+  extensionId: async ({ context }, use) => {
+    // for manifest v3:
+    let [background] = context.serviceWorkers()
+    if (!background)
+      background = await context.waitForEvent('serviceworker')
+
+    const extensionId = background.url().split('/')[2]
+    await use(extensionId)
+  },
+})
+
+export const expect = test.expect
+
+export function isDevArtifact() {
+  const manifest: Manifest.WebExtensionManifest = fs.readJsonSync(path.resolve(extensionPath, 'manifest.json'))
+  return Boolean(
+    typeof manifest.content_security_policy === 'object'
+    && manifest.content_security_policy.extension_pages?.includes('localhost'),
+  )
+}