- Removed redundant `gin.SetMode(gin.TestMode)` calls from individual test files.
- Introduced a centralized `TestMain` function in `testmain_test.go` to set the Gin mode for all tests.
- Ensured consistent test environment setup across various handler test files.
- Introduced EnhancedSecurityNotificationService for provider-based notifications.
- Added migration logic from legacy notification configuration to managed providers.
- Updated NotificationConfig model to reflect API surface changes and maintain legacy fields.
- Enhanced Cerberus middleware to dispatch security events based on feature flags.
- Updated routes to utilize the new enhanced service and handle migration at startup.
- Added feature flag for security provider events to control behavior in production.
- Updated tests to cover new functionality and ensure compatibility with existing behavior.
