Replace #[tokio::main] with a manual fn main() that builds the tokio
runtime explicitly. All async initialization moves into async_init().
When the appkit frontend is requested, the runtime context is entered
on the main thread and run_appkit_main_thread() is called directly,
giving AppKit thread 0 as required by MainThreadMarker. Ctrl+C is
handled via a spawned task that calls process::exit.
When appkit is not requested, behaviour is unchanged: block on Ctrl+C.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
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