feat: create autonomous Nivora package repository

Maintain a validated cross-distribution package catalog.
Automate upstream updates, isolated builds, diagnostics, and direct publication.
Build the official GitHub Desktop sources for Linux with working OAuth.

.gitignore

@@ -0,0 +1,11 @@
+*.deb
+*.rpm
+*.pkg.tar.*
+*.apk
+.stplr-spec-bc-export/
+__pycache__/
+*.pyc
+.venv/
+.idea/
+.vscode/
+*~