Add Mailjet HTTPS API as primary email provider

Add Brevo SMTP debug

Clean up mail.py

Debug Brevo credentials

Strip quotes from Brevo credentials

Brevo SMTP relay port 2525 (not blocked by HF)

Debug Brevo key + strip non-printable chars

Fix mail.py syntax error

Add Brevo HTTP API email support

Fix WS close before accept crash; fix Resend from address

Use Resend HTTP API for email (SMTP blocked on HF)

Fix async core calls, thread-local DB clients, WS case fix, schemas, mail