feat(llmo): include paid tier in CDN opt-in notification email

[khushboo5723]

Summary

• Loads org LLMO entitlement from the database when sending the first edge opt-in notification (llmo_cdn_opt_in_notification).
• Adds isPaidTier, customerTier, and tierKnown to Post Office templateData (same source of truth as GET /organizations/{id}/entitlements).
• Runs entitlement lookup in parallel with org members fetch; failures are logged and do not block the email.

Post Office follow-up

Update the llmo_cdn_opt_in_notification template top notes to use isPaidTier (paid) vs tierKnown + not paid (free/trial). Backend change alone does not change email copy until the template is updated.

Test plan

• npx mocha test/controllers/llmo/cdn-opt-in-notification.test.js (31 passing)
• After deploy: trigger first edge opt-in on a paid vs free-trial org and verify log line includes tierKnown / isPaidTier
• After Post Office template update: confirm top notes in received email

Made with Cursor

[github-actions]

This PR will trigger a minor release when merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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