fix(notifications): set default SMTP encryption value to prevent false validation error

[ShadowArcanist]

Changes

• Set default value for SMTP encryption to be starttls instead of null

Issues

• https://discord.com/channels/459365938081431553/1009176462399651971/1493548021965918238 (discord)

Notes:

This issue only happens on team level notification and UI shows StartTLS as selected by default but it is set to null by default so if user tries to save the changes it will throw encryption field is required (unless they manually select encryption option from the dropdown)

Category

• Bug fix

Preview

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After:

AI Assistance

• AI was used (please describe below)

If AI was used:

• Tools used: Jean + Claude (Opus 4.6)
• How extensively: every change on this PR (except the PR description)

Contributor Agreement

Important

• I have read and understood the contributor guidelines. If I have failed to follow any guideline, I understand that this PR may be closed without review.
• I have searched existing issues and pull requests (including closed ones) to ensure this isn't a duplicate.
• I have tested all the changes thoroughly with a local development instance of Coolify and I am confident that they will work as expected when a maintainer tests them.

[peaklabs-dev]

Thanks for the PR.