fix: disable actuator mail health check to stop gmail login throttling

[f-s-h]

Actuator's MailHealthIndicator opened a live SMTP connection to Gmail on every /actuator/health hit, which readiness/liveness probes poll every 10-20s, tripping Gmail's login-attempt rate limit.

Summary by CodeRabbit

• Bug Fixes
  • Improved health monitoring behavior by excluding mail service checks from the application health status.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ae7ef992-1244-4383-95d7-4eb7abca9f4f

📥 Commits

Reviewing files that changed from the base of the PR and between 23630c0 and 82e50d5.

📒 Files selected for processing (1)

• services/spring-letter/src/main/resources/application.properties

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📝 Walkthrough

Walkthrough

The Spring Letter service disables the Spring Boot actuator mail health indicator through a new application.properties setting.

Changes

Mail health configuration

Layer / File(s)	Summary
Disable mail health indicator services/spring-letter/src/main/resources/application.properties	Adds management.health.mail.enabled=false to disable mail health reporting.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: raphael-frank

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: disabling the Actuator mail health check to avoid Gmail login throttling.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bug/fix-smtp-limit

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