feat(06-03): export extract_browser_cookies in lib.rs

- Added extract_browser_cookies to public re-exports
- Auth module now fully accessible from library

src/lib.rs

@@ -52,6 +52,7 @@ pub use archive::{
 // Re-export auth types for library users
 pub use auth::{
     load_cookies_from_file, parse_netscape_cookies,
+    extract_browser_cookies,
 };
 
 /// Version of the gallery-dl crate