feat(sdk): add create-nitrolite-app project scaffolding tool

sdk/create-nitrolite-app/.gitignore

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+# Build output
+dist/
+
+# Auto-generated constants
+src/constants/version.ts
+
+# Dependencies
+node_modules/
+
+# Logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# TypeScript
+*.tsbuildinfo

sdk/create-nitrolite-app/README.md

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+# create-nitrolite-app
+
+A CLI tool to quickly create new Nitrolite applications with various templates and configurations.
+
+## Usage
+
+### Interactive Mode (Recommended)
+
+```bash
+npx create-nitrolite-app
+```
+
+### Quick Start
+
+```bash
+# Create with default template
+npx create-nitrolite-app my-app
+
+# Create with specific template
+npx create-nitrolite-app my-app --template nextjs-app
+
+# Skip prompts and use defaults
+npx create-nitrolite-app my-app --yes
+```
+
+### Advanced Usage
+
+```bash
+# Create without git initialization
+npx create-nitrolite-app my-app --no-git
+
+# Create without installing dependencies
+npx create-nitrolite-app my-app --no-install
+
+# Combine options
+npx create-nitrolite-app my-app --template nextjs-app --no-git --yes
+```
+
+## Available Templates
+
+### `nextjs-app`
+
+- Next.js 15 with App Router
+- TypeScript and TailwindCSS
+- Server-side rendering
+- Optimized for production
+
+## CLI Options
+
+| Option              | Description                  | Default      |
+| ------------------- | ---------------------------- | ------------ |
+| `--template <name>` | Template to use              | `react-vite` |
+| `--no-git`          | Skip git initialization      | `false`      |
+| `--no-install`      | Skip dependency installation | `false`      |
+| `--yes`             | Skip prompts, use defaults   | `false`      |
+| `--help`            | Show help                    | -            |
+| `--version`         | Show version                 | -            |
+
+## Development
+
+### Build
+
+```bash
+npm run build
+```
+
+### Development
+
+```bash
+npm run dev
+```
+
+### Test
+
+```bash
+npm test
+```
+
+## Project Structure
+
+```
+my-nitrolite-app/
+├── src/
+│   ├── components/        # React/Vue components
+│   ├── hooks/             # Custom hooks (React)
+│   ├── composables/       # Composables (Vue)
+│   ├── utils/             # Utility functions
+│   └── main.tsx           # Entry point
+├── public/                # Static assets
+├── package.json
+└── README.md
+```
+
+## Next Steps
+
+After creating your project:
+
+1. **Navigate to your project**:
+
+    ```bash
+    cd my-nitrolite-app
+    ```
+
+2. **Install dependencies** (if not done automatically):
+
+    ```bash
+    npm install
+    ```
+
+3. **Start development server**:
+
+    ```bash
+    npm run dev
+    ```
+
+4. **Configure your WebSocket endpoint** in the config file
+
+5. **Start building your Nitrolite application**!
+
+## Documentation
+
+- [Nitrolite SDK Documentation](https://github.com/erc7824/nitrolite)
+- [Examples](../../examples/)
+- [Issue Tracker](https://github.com/erc7824/nitrolite/issues)
+
+## Contributing
+
+Contributions are welcome! Please read the contributing guide in the main repository.
+
+## License
+
+ISC License - see the main repository for details.