Files
gorkem-bwl 8c27d60a85 Fix email template loading and conditional TLS configuration
## Changes

### Server-side (emailService.js)
- Fixed template path resolution: Changed default from `templates/` to `src/templates/`
  to correctly locate email templates in the project structure
- Added EMAIL_TEMPLATE_PATH environment variable support for Docker deployments
- Added input validation (validateEmailParams, validateFromAddress) to catch
  missing fields before attempting to send
- Implemented conditional TLS configuration - TLS settings only applied when
  systemEmailSecure is enabled, allowing services like Resend to work properly
- Added stronger content validation to prevent empty emails from being sent
- Added transporter.verify() before sending to catch configuration issues early
- Improved error logging with more context for debugging

### Client-side (SettingsEmail.jsx)
- Refactored settings preview to use buildEmailConfigPreview() builder function
- TLS fields now only shown in JSON preview when secure mode is enabled

Fixes #3054
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Checkmate backend

The backend service for Checkmate, an open source uptime and infrastructure monitoring application

This directory contains the backend of Checkmate, which handles data processing, storage, and API services for the Checkmate monitoring tool. The backend is responsible for managing uptime checks, handling real-time alerts, and storing historical monitoring data.

Checkmate's backend is designed to be lightweight and scalable, ensuring reliable performance even with a high number of active monitors.

Installation & documentation

For setup instructions, configuration details, and deployment guidelines, please visit our official documentation at docs.checkmate.so.