feat(catalog): mbox header scan, company legal-suffix match, apply order

Add --mbox-headers for Thunderbird folder files; strip GmbH/& Co. KG in
CompanyGroupingKey; FindCompany falls back to full scan; apply companies
before persons. Tightens role-mailbox noise filters.

catalog/mbox_test.go

@@ -0,0 +1,67 @@
+package catalog
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestParseMboxHeaderEmails(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "INBOX")
+	body := `From - Mon Jul 1 00:00:00 2016
+From: Axel Schaefer <axel.schaefer@wheregroup.com>
+To: Andriy Oblivantsev <andriy.oblivantsev@wheregroup.com>
+Cc: noreply@example.com, client@stadt-example.de
+Subject: test
+
+Body line ignored
+From - Mon Jul 2 00:00:00 2016
+From: Someone <paul.schmidt@wheregroup.com>
+To: list@wheregroup.com
+
+more body
+`
+	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	ents, err := parseMboxHeaderEmails(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := map[string]bool{}
+	for _, e := range ents {
+		if len(e.Emails) > 0 {
+			got[e.Emails[0]] = true
+		}
+	}
+	if !got["axel.schaefer@wheregroup.com"] || !got["andriy.oblivantsev@wheregroup.com"] {
+		t.Fatalf("%v", got)
+	}
+	if got["noreply@example.com"] {
+		t.Fatal("noreply should be filtered")
+	}
+	if !got["client@stadt-example.de"] {
+		t.Fatal("missing client")
+	}
+}
+
+func TestScanThunderbirdRootOptsMbox(t *testing.T) {
+	root := t.TempDir()
+	imap := filepath.Join(root, "ImapMail", "mail.example.com")
+	if err := os.MkdirAll(imap, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(imap, "INBOX"), []byte(
+		"From - x\nFrom: a@wheregroup.com\nTo: b@wheregroup.com\n\nbody\n",
+	), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	doc, err := ScanThunderbirdRootOpts(root, ScanOptions{MboxHeaders: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(doc.Entries) < 2 {
+		t.Fatalf("%+v", doc.Entries)
+	}
+}