feat: add RPM packaging with nfpm and Gitea registry publishing

Bundles the CLI into a standalone binary via bun compile, packages
as RPM with nfpm, and publishes to Gitea's built-in package registry.
Users install with: dnf config-manager --add-repo <gitea>/rpm.repo

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -15,7 +15,9 @@
     "clean": "pnpm -r run clean && rimraf node_modules",
     "db:up": "docker compose -f deploy/docker-compose.yml up -d",
     "db:down": "docker compose -f deploy/docker-compose.yml down",
-    "typecheck": "tsc --build"
+    "typecheck": "tsc --build",
+    "rpm:build": "bash scripts/build-rpm.sh",
+    "rpm:publish": "bash scripts/publish-rpm.sh"
   },
   "engines": {
     "node": ">=20.0.0",