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).

internal/web/handlers_monitor_test.go

@@ -0,0 +1,21 @@
+package web
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+// After log rotation renames mail.log away, Postfix takes about a second to
+// recreate it on reload (spec B.2); a missing file in that window is a normal,
+// transient gap, not an operator-facing failure.
+func TestReadLogTailMissingFileIsNotAnError(t *testing.T) {
+	s := &Server{cfg: Config{MailLogPath: filepath.Join(t.TempDir(), "mail.log")}}
+
+	lines, errText := s.readLogTail()
+	if lines != nil {
+		t.Errorf("lines = %v, want nil", lines)
+	}
+	if errText != "" {
+		t.Errorf("errText = %q, want empty (missing file is not an error)", errText)
+	}
+}