feat(widget): 准备 npm 包发布

- 添加 GitHub Actions 工作流以在推送标签时自动发布到 npm
- 更新 package.json，包含包名、版本、描述、作者等信息
- 添加 README.md、LICENSE 和 .npmignore 文件
- 更新根目录 .gitignore，忽略 .npmrc 文件

docs/widget/package.json

@@ -1,12 +1,19 @@
 {
-  "name": "widget",
-  "version": "0.0.0",
+  "name": "cwd-widget",
+  "version": "0.0.1",
+  "description": "Server-free, extremely fast and secure, plug-and-play commenting system based on Cloudflare Workers and the Global Edge Network.",
   "type": "module",
+  "author": "anghunk",
+  "license": "Apache-2.0",
   "scripts": {
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview"
   },
+  "keywords": [
+    "cloudflare workers",
+    "Comment"
+  ],
   "devDependencies": {
     "terser": "^5.44.1",
     "vite": "^6.0.11",
@@ -16,4 +23,4 @@
     "dompurify": "^3.3.1",
     "marked": "^17.0.1"
   }
-}
+}