Introduces a new 'Webhook (Custom)' notification channel allowing users to send JSON payloads to any HTTP endpoint (e.g., n8n, Zapier, custom APIs). Updates the UI to support webhook configuration, adds backend validation, and implements the WebhookChannel for sending notifications. Documentation is updated with usage instructions and payload examples.
Extracted all email sending logic into a new EmailHelper class for centralized management and improved error handling. Updated AuthController, SettingsController, and EmailChannel to use EmailHelper for sending emails and logging. Added auto-detection of SMTP encryption based on port in both backend (SettingsController) and frontend (settings view), improving user experience and reducing misconfiguration. Enhanced logging for email operations and improved UI feedback for encryption selection.
