Initial commit: minimal JavaScript template with Nix

Features:
- Nix + Flakes for reproducible environments
- Bun (fast JavaScript runtime)
- Vite (development server & build tool)
- ESLint + Prettier (linting & formatting)
- Devshell commands via just
- Modular structure using flake-parts
- Omnix template support for initialization

.gitignore

@@ -0,0 +1,9 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+build/
+
+# Direnv
+.direnv/