Replace $guarded usage with explicit $fillable arrays across all models.
Sync fillable definitions with current database schema and add tests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- 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
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Co-Authored-By: Claude <noreply@anthropic.com>