Sanitize for open-source release

- Replace internal tenant name yitanger.feishu.cn with your-tenant.feishu.cn
- Replace real wiki token with placeholder WikiNodeTokenExample
- Parameterize tenant via FEISHU_TENANT env var in feishu-to-md.mjs
- Expand .gitignore to cover cookies, auth artifacts, IDE files

auto-scrape.mjs

@@ -7,7 +7,7 @@
  *
  * 示例：
  *   node auto-scrape.mjs https://yitang.top/fs-doc/abc123/docId
- *   node auto-scrape.mjs https://yitanger.feishu.cn/wiki/R9NywV2i9i...
+ *   node auto-scrape.mjs https://your-tenant.feishu.cn/wiki/WikiNodeTokenExample...
  *
  * Cookie 持久化：首次登录后自动保存，之后无需重复扫码。
  */
@@ -41,7 +41,7 @@ if (!args[0] || args[0] === '--help' || args[0] === '-h') {
 
 示例：
   node auto-scrape.mjs https://yitang.top/fs-doc/abc/docId
-  node auto-scrape.mjs https://yitanger.feishu.cn/wiki/R9NywV2i9izjuqkPd63cWuafn4g
+  node auto-scrape.mjs https://your-tenant.feishu.cn/wiki/WikiNodeTokenExample
   node auto-scrape.mjs https://yitang.top/fs-doc/abc/docId 课程笔记.md
 `);
   process.exit(0);