tom 021b087a12 fix(mail): improve channel subscribe/unsubscribe feedback ...

- Report "already subscribed" instead of false success on re-subscribe
- Report "not subscribed" instead of false success on redundant unsubscribe
- Add explicit channel existence check before subscribe/unsubscribe
- Return empty JSON array [] instead of null for no subscribers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-17 09:49:53 -08:00

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