chore: change license from Apache-2.0 to MIT (#534)

Changed the project license from Apache-2.0 to MIT for maximum
permissiveness and openness.

Changes:
- Cargo.toml: Updated license field from "Apache-2.0" to "MIT"
- LICENSE: Replaced Apache-2.0 text with MIT license text
- README.md: Updated license badge and section from Apache 2.0 to MIT

MIT is a simpler, more permissive license that allows for maximum
flexibility while still requiring attribution and disclaiming warranty.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -10,7 +10,7 @@
 </p>
 
 <p align="center">
-  <a href="LICENSE"><img src="https://img.shields.io/badge/license-Apache%202.0-blue.svg" alt="License: Apache 2.0" /></a>
+  <a href="LICENSE"><img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="License: MIT" /></a>
   <a href="NOTICE"><img src="https://img.shields.io/badge/contributors-27+-green.svg" alt="Contributors" /></a>
   <a href="https://buymeacoffee.com/argenistherose"><img src="https://img.shields.io/badge/Buy%20Me%20a%20Coffee-Donate-yellow.svg?style=flat&logo=buy-me-a-coffee" alt="Buy Me a Coffee" /></a>
 </p>
@@ -635,7 +635,7 @@ We're building in the open because the best ideas come from everywhere. If you'r
 
 ## License
 
-Apache 2.0 — see [LICENSE](LICENSE) and [NOTICE](NOTICE) for contributor attribution
+MIT — see [LICENSE](LICENSE) and [NOTICE](NOTICE) for contributor attribution
 
 ## Contributing