feat(playground): add playground package scaffold (#120)

* feat(playground): add playground package scaffold

Author: andrewmelchor

bun.lock

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+# deps
+node_modules/

packages/playground/.gitignore

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+# @t-req/playground
+
+Development playground for testing `treq init` functionality without external dependencies.
+
+## Purpose
+
+This package provides a self-contained environment for developing and testing t-req initialization features. It removes the need to rely on third-party dependencies during development by providing a local server and test environment.
+
+## Getting Started
+
+### Prerequisites
+
+- [Bun](https://bun.sh) installed
+
+### Installation
+
+```bash
+bun install
+```
+
+### Development
+
+Start the development server with hot reloading:
+
+```bash
+bun run dev
+```
+
+The server will start at `http://localhost:3000`.
+
+## Usage
+
+The playground currently exposes a simple Hono server for testing. You can extend this to:
+
+- Test t-req initialization workflows
+- Mock external API responses
+- Validate request/response handling
+- Experiment with new features before integrating into the main packages
+
+## Project Structure
+
+```
+.
+├── src/
+│   └── index.ts          # Main server entry point
+├── package.json          # Dependencies (Hono + Bun types)
+├── tsconfig.json         # TypeScript configuration
+└── README.md            # This file
+```
+
+## Related Packages
+
+- [`@t-req/core`](../core) - Core parsing and execution engine
+- [`@t-req/app`](../app) - CLI, TUI, and server implementation
+
+## License
+
+See repository root for license information.

packages/playground/README.md

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+{
+  "name": "@t-req/playground",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "dev": "bun run --hot src/index.ts"
+  },
+  "dependencies": {
+    "hono": "^4.12.5"
+  },
+  "devDependencies": {
+    "@types/bun": "latest"
+  }
+}

packages/playground/package.json

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+import { Hono } from 'hono';
+
+const app = new Hono();
+
+app.get('/', (c) => {
+  return c.text('Hello Hono!');
+});
+
+export default app;

packages/playground/src/index.ts

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+{
+  "compilerOptions": {
+    "strict": true,
+    "jsx": "react-jsx",
+    "jsxImportSource": "hono/jsx"
+  }
+}