fix: add UUID support to CloudProviderToken model

- Add uuid column to cloud_provider_tokens table via migration
- Update CloudProviderToken to extend BaseModel for auto UUID generation
- Generate UUIDs for existing records in migration
- Fixes null uuid issue in API responses

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

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

app/Models/CloudProviderToken.php

@@ -2,9 +2,7 @@
 
 namespace App\Models;
 
-use Illuminate\Database\Eloquent\Model;
-
-class CloudProviderToken extends Model
+class CloudProviderToken extends BaseModel
 {
     protected $guarded = [];