fix: replace Bun-specific APIs with Node.js APIs for npm compatibility

- Replace Bun.spawn with exec from child_process in extract.ts
- Replace Bun.file().exists() with access from fs/promises
- Replace Bun.write with writeFile from fs/promises in github.ts
- Add cp and rm from fs/promises for file operations
- Bump version to 1.0.2

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

cli/src/index.ts

@@ -12,7 +12,7 @@ const program = new Command();
 program
   .name('uipro')
   .description('CLI to install UI/UX Pro Max skill for AI coding assistants')
-  .version('1.0.0');
+  .version('1.0.2');
 
 program
   .command('init')