v0.0.5

feat(postfix): sendgrid relay, discard transports, and vault-driven provisioning

• Add sender-dependent relayhost maps and per-profile SendGrid SASL
• Add mail_virtual_transports for inbound discard (noreply blackhole)
• Tag ansible tasks for update.sh (db-provision, postfix-provision, reload)
• Run db-provision in update.sh so vault mail data syncs to MySQL
• Fix SQL statement termination in postfix-db-provision for aliases/transports
• Restore MX and mail A record screenshot markdown in Requirements
• Document @Domain default relay and per-mailbox override precedence
• Add postmap verification for multiple mailboxes on one domain
• fix(postfix): avoid trim_blocks merging smtp_tls lines in main.cf