client-core: EnrolledServer, the aiapp:// enrol-link parser (RUST.md's E4)

A Rust client needs the same host/port/token an Android phone gets from
scanning an aiapp://enroll?... QR, so a desktop build can enrol from the
identical text pasted rather than a second format invented for it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

client-core/src/lib.rs

@@ -4,6 +4,7 @@
 
 pub mod ansi;
 pub mod api;
+pub mod config;
 pub mod event_stream;
 pub mod highlight;
 pub mod notifications;