feat: Replace cargo-dist with simplified release workflow

- Remove cargo-dist and cargo-release dependencies
- Add single workflow that merges main→release, bumps version, builds, releases
- Version format: YYYY.MM.DD.HHmm
- Main branch stays at 0.0.0-dev
- Builds for: aarch64-apple-darwin, x86_64-linux-gnu, x86_64-linux-musl, aarch64-linux-gnu
- Use default GITHUB_TOKEN instead of app token

Author: kejadlen