Import rpm.lair.cafe SPA from lair/mistralrs-package/ui @34a28b5

Dedicated repo for the RPM repository web UI, moved out of the
mistralrs-package repo now that multiple package repos publish to
rpm.lair.cafe. Includes an adapted deploy workflow (SPA at repo root).

README.md

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+# rpm.lair.cafe
+
+Web UI for the [`rpm.lair.cafe`](https://rpm.lair.cafe) dnf repository — a small
+React + Vite SPA that lists the packages published across the Fedora trees and
+links to their RPMs and changelogs.
+
+It reads the per-tree `packages.json` manifests generated by the package repos
+(e.g. `lair/mistralrs-package`, `lair/claude-desktop-package`) when they publish.
+
+## Development
+
+```bash
+npm install
+npm run dev
+```
+
+## Deploy
+
+`.gitea/workflows/deploy.yml` builds the SPA and rsyncs `dist/` to
+`gitea_ci@oolon.kosherinata.internal:/var/www/rpm/` on every push to `main`.
+The rsync filter only touches `index.html`, `*.repo`, and `assets/**`, so the
+co-located RPM trees (`fedora/**`, GPG keys, `packages.json`) are left untouched.
+Requires the `RSYNC_SSH_KEY` Actions secret.
+
+## Adding a Fedora release
+
+The SPA fetches `packages.json` from each Fedora tree. To surface a new
+releasever, add it to `RELEASEVERS` in `src/hooks/usePackages.ts`.
+
+---
+History note: this SPA previously lived in `lair/mistralrs-package/ui/`;
+imported here from that repo at commit `34a28b5`.