Use async/await over callbacks and .then()

Prefer async/await for asynchronous code:
- More readable than callbacks or .then() chains
- Easier error handling with try/catch
- Works naturally with loops and conditionals

```typescript
// Good
async function fetchUserData(id: string): Promise {
try {
const response = await fetch(`/api/users/${id}`);
if (!response.ok) throw new Error('Failed to fetch');
return await response.json();
} catch (error) {
logger.error('Failed to fetch user', { id, error });
throw error;
}
}

// Avoid
function fetchUserData(id) {
return fetch(`/api/users/${id}`)
.then(res => res.json())
.catch(err => console.log(err));
}
```