Relicense ArtCraft under MIT OR Apache-2.0 (#2043)

## Summary
- Removes the WIP fair-source `LICENSE.md` and adds `LICENSE-MIT` and
`LICENSE-APACHE`, matching PhotoCraft, LightCraft, and the other craft
apps.
- Adds `NOTICE`, which lists bundled third-party material (ammo.js, the
vendored tauri-plugin-http, normalize.css, three-dots, Font Awesome
icons, the Carter One font) and says that provider logos are trademarks
of their owners.
- Updates the README's License section, and sets `license` in
`crates/desktop/artcraft/Cargo.toml` and `frontend/package.json` to `MIT
OR Apache-2.0`.

## Follow-up needed
`NOTICE` excludes assets that ArtCraft doesn't own: Nintendo sound
effects in `resources/sound/`, meme images, the AllSky-style gray/night
skyboxes, the Lumine VMD, and the Mixamo animation GIFs. The exclusion
only says these files aren't MIT/Apache. They still need to be replaced
or removed in a separate PR. Nobody has confirmed where the avatars,
default covers, `characters/img*.png`, and the day skybox came from.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/desktop/artcraft/Cargo.toml

@@ -3,7 +3,7 @@ name = "artcraft"
 version = "0.0.1"
 description = "Artcraft"
 authors = ["you"]
-license = ""
+license = "MIT OR Apache-2.0"
 repository = ""
 edition = "2021"
 rust-version = "1.77.2"