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

README.md

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+# JavaScript Template
+
+A minimal JavaScript development template using Nix. Key features:
+
+- Nix + Flakes for reproducible environments
+- Bun (fast JavaScript runtime)
+- Vite (development server & build tool)
+- ESLint + Prettier (linting & formatting)
+- Devshell commands via just
+
+## Prerequisites
+
+- [Nix](https://nixos.org/download.html) with flakes enabled
+- [direnv](https://direnv.net/) (optional but recommended)
+
+## Getting Started
+
+Initialize a new project using [omnix](https://omnix.page):
+
+```sh
+nix run nixpkgs#omnix -- \
+  init github:sajenim/javascript-template -o ./my-project
+```
+
+Then enter the development environment:
+
+```sh
+cd my-project
+direnv allow  # Or use: nix develop
+just dev
+```
+
+**NixOS users:** If bun-installed binaries fail to find system libraries, enable FHS compatibility:
+
+```nix
+# nix/modules/devshell.nix
+fhs = true;
+```
+
+## Customization
+
+This template provides minimal, sensible defaults. Customize as needed:
+
+- Add dependencies: `just add <package>`
+- Modify linting rules in `eslint.config.js`
+- Add Prettier config via `.prettierrc` if needed
+- Extend `Justfile` with project-specific commands
+
+## Acknowledgments
+
+- [srid's haskell-template](https://github.com/srid/haskell-template)