- Remove serde_yaml and tokio from Cargo.toml (unused)
- Add #[allow(dead_code)] to utility code kept for future use
(CUT_FULL, ALIGN_RIGHT, line(), PrinterError, SupabaseError,
atualizar_sync, remover, Lock variant)
- Zero compiler warnings on release build
- Storage: SQLite local via rusqlite
- Supabase: REST API via reqwest
- Printer: USB ESC/POS for TM-T20
- Frontend: vanilla HTML (form-v9.3 ported)
- Build: GitHub Actions for Linux/Windows/macOS
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