release: 0.1.0: Phases 0-11: panel, Postfix/DKIM, milter, backup, Docker image

Initial feature-complete implementation of the v1.0 specification (phases 0-11 of `docs/implementation-plan.md`).
Added:
  - Panel (Go, single static binary) with SQLite persistence, one-time
  - Domain management with per-domain DKIM (RSA-2048, generated in pure Go) and
  - Application (sender identity) management: SASL credentials via `sasldb2`,
  - Full Postfix relay config generated from env at container start: SMTPS 465,
  - Journal milter (pure Go, `go-milter`) recording every send to `send_log`;
  … (6 more in CHANGELOG)

Full detail: CHANGELOG.md (0.1.0).

build/logrotate-mail.conf

@@ -0,0 +1,12 @@
+/var/log/mail.log {
+	daily
+	rotate 14
+	missingok
+	notifempty
+	compress
+	delaycompress
+	create 0644 root root
+	postrotate
+		/usr/sbin/postfix reload
+	endscript
+}