Prepare v0.1.1 release for crates.io

- Rename `macros` crate to `libmarathon-macros` for better discoverability on crates.io
- Update all imports from `macros::` to `libmarathon_macros::`
- Add crates.io metadata (description, license, repository, homepage, etc.)
- Bump version to 0.1.1
- Add version requirement for libmarathon-macros dependency

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

crates/macros/src/lib.rs

@@ -160,7 +160,7 @@ pub fn derive_draw_function_label(input: TokenStream) -> TokenStream {
 /// # Example
 ///
 /// ```no_compile
-/// use macros::synced;
+/// use libmarathon_macros::synced;
 ///
 /// #[synced]
 /// pub struct CubeMarker {