Add create-plugin CLI tool for scaffolding new plugins

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/create-plugin/README.md

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+# @object-ui/create-plugin
+
+CLI tool to quickly scaffold new ObjectUI plugins with best practices.
+
+## Usage
+
+```bash
+# Using pnpm
+pnpm create @object-ui/plugin my-plugin
+
+# Using npm
+npm create @object-ui/plugin my-plugin
+
+# Using npx
+npx @object-ui/create-plugin my-plugin
+```
+
+## What Gets Generated
+
+The tool creates a complete plugin package structure:
+
+```
+packages/plugin-my-plugin/
+├── src/
+│   ├── index.tsx           # Plugin export & registration
+│   ├── MyPluginImpl.tsx    # Component implementation
+│   ├── MyPluginImpl.test.tsx # Tests
+│   └── types.ts            # Schema definitions
+├── package.json
+├── tsconfig.json
+├── vite.config.ts
+└── README.md
+```
+
+## Features
+
+- ✅ TypeScript support out of the box
+- ✅ Vite build configuration
+- ✅ Component registration with ComponentRegistry
+- ✅ Test setup with Vitest
+- ✅ Proper package.json with workspace dependencies
+- ✅ README template
+- ✅ Type definitions
+
+## Interactive Mode
+
+Run without arguments for interactive prompts:
+
+```bash
+pnpm create @object-ui/plugin
+```
+
+You'll be prompted for:
+- Plugin name
+- Description
+- Author name
+
+## Options
+
+```bash
+pnpm create @object-ui/plugin my-plugin --description "My awesome plugin" --author "Your Name"
+```
+
+## After Creation
+
+1. Navigate to the plugin directory:
+   ```bash
+   cd packages/plugin-my-plugin
+   ```
+
+2. Install dependencies:
+   ```bash
+   pnpm install
+   ```
+
+3. Build the plugin:
+   ```bash
+   pnpm build
+   ```
+
+4. Run tests:
+   ```bash
+   pnpm test
+   ```
+
+## License
+
+MIT

packages/create-plugin/package.json

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+{
+  "name": "@object-ui/create-plugin",
+  "version": "0.3.1",
+  "description": "CLI tool to scaffold ObjectUI plugins",
+  "type": "module",
+  "license": "MIT",
+  "bin": {
+    "create-plugin": "./dist/index.js"
+  },
+  "files": [
+    "dist",
+    "templates"
+  ],
+  "scripts": {
+    "build": "tsup",
+    "dev": "tsup --watch",
+    "test": "vitest run",
+    "lint": "eslint ."
+  },
+  "dependencies": {
+    "chalk": "^5.4.1",
+    "commander": "^14.0.2",
+    "fs-extra": "^11.2.0",
+    "prompts": "^2.4.2"
+  },
+  "devDependencies": {
+    "@types/fs-extra": "^11.0.4",
+    "@types/node": "^25.0.10",
+    "@types/prompts": "^2.4.9",
+    "tsup": "^8.0.0",
+    "typescript": "^5.9.3",
+    "vitest": "^4.0.18"
+  }
+}