Introduce ContactPerson and ContactBusiness subclasses

Splits the Contact class into ContactPerson (content_type_guid='contactperson')
and ContactBusiness (content_type_guid='contactbusiness'), each using 'contact'
as the shared package-level xref schema. Replaces the $isPerson/$00 xref hack
with proper class identity via instanceof.

- ContactPerson.php, ContactBusiness.php: new subclasses
- Contact.php: loadXrefTypeList() reads type tags directly from liberty_xref;
  getAvailableTypeItems() for edit form (schema-driven with pre-upgrade fallback);
  getDisplayUrl() now points to display_contact.php
- Type item codes: P01/P02 (person), B01-B04 (business, B01=Service new)
- list_people.php, list_businesses.php: separate list pages per type
- list_contacts.php: combined display-layer merge of both types
- 5.0.3.php: upgrade script migrating existing data to new content types and codes
- Templates: isPerson flag from instanceof; horizontal type checkboxes; list.tpl
  accepts $listTitle; menu adds People/Businesses entries

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2 files changed, 9 insertions, 5 deletions

diff --git a/import/ImportContactCSV.php b/import/ImportContactCSV.php
index ada5732..a6e6b1d 100644
--- a/import/ImportContactCSV.php
+++ b/import/ImportContactCSV.php
@@ -24,6 +24,8 @@
 namespace Bitweaver\Liberty;
 
 use Bitweaver\Contact\Contact;
+use Bitweaver\Contact\ContactPerson;
+use Bitweaver\Contact\ContactBusiness;
 
 /**
  * Delete any existing xref for ($contentId, $item) then re-insert if either $xkey or
@@ -95,14 +97,16 @@ function contactCsvImportRow( array $row, int $rowNum ): array {
 		return $result;
 	}
 
-	// --- Find existing or create new via Contact class ---
+	// --- Find existing or create new via Contact subclass ---
+	$isPerson = ( $type === '$00' );
+
 	$contentId = $gBitDb->getOne(
 		"SELECT `content_id` FROM `" . BIT_DB_PREFIX . "liberty_content`
-		 WHERE `content_type_guid` = 'contact' AND `title` = ?",
+		 WHERE `content_type_guid` IN ('contactperson','contactbusiness','contact') AND `title` = ?",
 		[ $title ]
 	);
 
-	$contact = new Contact( null, $contentId ?: null );
+	$contact = $isPerson ? new ContactPerson( null, $contentId ?: null ) : new ContactBusiness( null, $contentId ?: null );
 	if( $contentId ) {
 		$contact->load();
 	}
@@ -118,7 +122,7 @@ function contactCsvImportRow( array $row, int $rowNum ): array {
 
 	if( !empty( $type ) && $type[0] === '$' ) {
 		$pHash['contact_types'] = [ $type ];
-		if( $type === '$00' ) {
+		if( $isPerson ) {
 			$pHash['name'] = $personName;
 		}
 	}
diff --git a/import/load_contacts_csv.php b/import/load_contacts_csv.php
index 3a75030..4e8adc7 100644
--- a/import/load_contacts_csv.php
+++ b/import/load_contacts_csv.php
@@ -52,7 +52,7 @@ if( !file_exists( $csvFile ) ) {
 				if( empty( $title ) ) continue;
 				$contentId = $gBitDb->getOne(
 					"SELECT `content_id` FROM `" . BIT_DB_PREFIX . "liberty_content`
-					 WHERE `content_type_guid` = 'contact' AND `title` = ?",
+					 WHERE `content_type_guid` IN ('contactperson','contactbusiness') AND `title` = ?",
 					[ $title ]
 				);
 				if( $contentId ) {