Added Oxibadge, a minimal Tauri + Svelte desktop client

Scaffolds the oxibadge crate/frontend as a new workspace member, stripped
down to a bare hello-world, and
extends the CI pipeline

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

oxibadge/README.md

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+<div align="center">
+
+# Oxibadge 🪪
+
+[![Rust](https://img.shields.io/badge/Rust-f74c00?logo=rust)](https://www.rust-lang.org)
+[![Claude Code](https://img.shields.io/badge/Claude%20Code-grey?logo=claude&logoColor=d97757)](https://claude.com/product/claude-code)
+[![GNU AGPLv3.0 License](https://img.shields.io/badge/License-GNU%20AGPLv3.0-dark_green?logo=gnu)](https://choosealicense.com/licenses/agpl-3.0)
+[![Buymeacoffee](https://img.shields.io/badge/Buymeacoffee-gray?logo=buymeacoffee)](https://buymeacoffee.com/nicolabelluti)
+<br>
+[![CI Badge](https://git.nicolabelluti.me/nicolabelluti/r701/actions/workflows/check-format-and-test.yaml/badge.svg)](https://git.nicolabelluti.me/nicolabelluti/r701/actions/?workflow=check-format-and-test.yaml)
+
+</div><br>
+
+> A reverse-engineered client for the
+> [R701](https://ipsattendant.it/rilevatore-presenze-r701/) attendance reader by
+> [I.P.S. Informatica](https://ipsinformatica.info/)
+
+If you want to read about this reverse engineering attempt, check out
+<https://nicolabelluti.me/series/attendance-reader/>.