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/package.json

@@ -0,0 +1,75 @@
+{
+  "name": "bilinote-extension",
+  "displayName": "BiliNote",
+  "version": "0.1.0",
+  "private": true,
+  "packageManager": "pnpm@9.7.1",
+  "description": "在浏览器里把视频链接一键变成 Markdown 笔记（Bilibili / YouTube / Douyin / Kuaishou）",
+  "scripts": {
+    "dev": "npm run clear && cross-env NODE_ENV=development run-p dev:*",
+    "dev-firefox": "npm run clear && cross-env NODE_ENV=development EXTENSION=firefox run-p dev:*",
+    "dev:prepare": "esno scripts/prepare.ts",
+    "dev:background": "npm run build:background -- --mode development",
+    "dev:web": "vite",
+    "dev:js": "npm run build:js -- --mode development",
+    "build": "cross-env NODE_ENV=production run-s clear build:web build:prepare build:background build:js",
+    "build:prepare": "esno scripts/prepare.ts",
+    "build:background": "vite build --config vite.config.background.mts",
+    "build:web": "vite build",
+    "build:js": "vite build --config vite.config.content.mts",
+    "pack": "cross-env NODE_ENV=production run-p pack:*",
+    "pack:zip": "rimraf extension.zip && jszip-cli add extension/* -o ./extension.zip",
+    "pack:crx": "crx pack extension -o ./extension.crx",
+    "pack:xpi": "cross-env WEB_EXT_ARTIFACTS_DIR=./ web-ext build --source-dir ./extension --filename extension.xpi --overwrite-dest",
+    "start:chromium": "web-ext run --source-dir ./extension --target=chromium",
+    "start:firefox": "web-ext run --source-dir ./extension --target=firefox-desktop",
+    "clear": "rimraf --glob extension/dist extension/manifest.json extension.*",
+    "lint": "eslint --cache .",
+    "test": "vitest test",
+    "test:e2e": "playwright test",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "@antfu/eslint-config": "^2.27.0",
+    "@ffflorian/jszip-cli": "^3.8.5",
+    "@iconify/json": "^2.2.239",
+    "@playwright/test": "^1.46.1",
+    "@types/fs-extra": "^11.0.4",
+    "@types/markdown-it": "^14.1.2",
+    "@types/node": "^22.5.0",
+    "@types/webextension-polyfill": "^0.12.0",
+    "@typescript-eslint/eslint-plugin": "^8.2.0",
+    "@unocss/reset": "^0.62.2",
+    "@vitejs/plugin-vue": "^5.1.2",
+    "@vue/compiler-sfc": "^3.4.38",
+    "@vue/test-utils": "^2.4.6",
+    "@vueuse/core": "^11.0.1",
+    "chokidar": "^3.6.0",
+    "cross-env": "^7.0.3",
+    "crx": "^5.0.1",
+    "eslint": "^9.9.0",
+    "esno": "^4.7.0",
+    "fs-extra": "^11.2.0",
+    "jsdom": "^24.1.1",
+    "kolorist": "^1.8.0",
+    "lint-staged": "^15.2.9",
+    "npm-run-all": "^4.1.5",
+    "rimraf": "^6.0.1",
+    "simple-git-hooks": "^2.11.1",
+    "typescript": "^5.5.4",
+    "unocss": "^0.62.2",
+    "unplugin-auto-import": "^0.18.2",
+    "unplugin-icons": "^0.19.2",
+    "unplugin-vue-components": "^0.27.4",
+    "vite": "^5.4.2",
+    "vitest": "^2.0.5",
+    "vue": "^3.4.38",
+    "vue-demi": "^0.14.10",
+    "web-ext": "^8.2.0",
+    "webext-bridge": "^6.0.1",
+    "webextension-polyfill": "^0.12.0"
+  },
+  "dependencies": {
+    "markdown-it": "^14.1.0"
+  }
+}