Replaced the fixed `alert_recipients` list with customizable subject and body templates for alerts and warnings. This allows for more flexible and dynamic email notifications using placeholder variables. Updated relevant backend and frontend components to support this feature.
Introduced a new optional "from_name" attribute to email settings, allowing customization of the sender's display name in outgoing emails. Updated backend models, APIs, and front-end components to include and handle this field properly. This enhances email clarity and personalization for users.
This commit implements the addition of `target_owners` and `alert_notification_events` tables, enabling management of responsible users for targets. Backend and frontend components are updated to allow viewing, assigning, and notifying target owners about critical alerts via email.
