feat: support Chrome multi-profile cookie extraction

Auto-iterates all Chrome/Arc/Edge/Brave profiles (Default, Profile 1,
Profile 2, ...) to find Twitter cookies. Falls back to the default
browser_cookie3 behavior when no profile dirs are found.

Set TWITTER_CHROME_PROFILE env var to specify a profile explicitly:
  TWITTER_CHROME_PROFILE='Profile 2' twitter feed

Closes #6

README.md

@@ -148,6 +148,12 @@ twitter-cli uses this auth priority:
 
 Browser extraction is recommended — it forwards ALL Twitter cookies (not just `auth_token` + `ct0`) and aligns request headers with your local runtime, which is closer to normal browser traffic than minimal cookie auth.
 
+**Chrome multi-profile**: All Chrome profiles are scanned automatically. To specify a profile:
+
+```bash
+TWITTER_CHROME_PROFILE="Profile 2" twitter feed
+```
+
 After loading cookies, the CLI performs lightweight verification. Commands that require account access fail fast on clear auth errors (`401/403`).
 
 ### Proxy Support
@@ -407,6 +413,12 @@ twitter follow elonmusk --json
 
 推荐使用浏览器提取方式，会转发所有 Twitter Cookie，并按本机运行环境生成语言和平台请求头；它比仅发送 `auth_token` + `ct0` 更接近普通浏览器流量，但不等于完整浏览器自动化。
 
+**Chrome 多 Profile 支持**：会自动遍历所有 Chrome profile。也可以通过环境变量指定：
+
+```bash
+TWITTER_CHROME_PROFILE="Profile 2" twitter feed
+```
+
 ### 代理支持
 
 设置 `TWITTER_PROXY` 环境变量即可：