chore: 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

crates/libmarathon/src/render/render_graph/node.rs

@@ -18,7 +18,7 @@ use downcast_rs::{impl_downcast, Downcast};
 use thiserror::Error;
 use variadics_please::all_tuples_with_size;
 
-pub use macros::RenderLabel;
+pub use libmarathon_macros::RenderLabel;
 
 use super::{InternedRenderSubGraph, RenderSubGraph};