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.

crm_normalize_test.go

@@ -65,6 +65,10 @@ func TestCompanyGroupingKey(t *testing.T) {
 	if a != b {
 		t.Fatalf("%q != %q", a, b)
 	}
+	if CompanyGroupingKey("WhereGroup") != CompanyGroupingKey("WhereGroup GmbH & Co. KG,") {
+		t.Fatalf("legal suffix should not change grouping key: %q vs %q",
+			CompanyGroupingKey("WhereGroup"), CompanyGroupingKey("WhereGroup GmbH & Co. KG,"))
+	}
 }
 
 func TestOpportunityTitlesMatchSlogan(t *testing.T) {