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>

1 files changed, 3 insertions, 3 deletions

diff --git a/add_person.php b/add_person.php
index eda69c7..68e3599 100644
--- a/add_person.php
+++ b/add_person.php
@@ -4,7 +4,7 @@
  * @subpackage functions
  */
 
-use Bitweaver\Contact\Contact;
+use Bitweaver\Contact\ContactPerson;
 use Bitweaver\KernelTools;
 
 require_once '../kernel/includes/setup_inc.php';
@@ -14,7 +14,7 @@ global $gBitSystem, $gBitSmarty, $gBitUser;
 $gBitSystem->verifyPackage( 'contact' );
 $gBitSystem->verifyPermission( 'p_contact_update' );
 
-$gContent = new Contact();
+$gContent = new ContactPerson();
 
 if( !empty( $_REQUEST['fCancel'] ) ) {
 	KernelTools::bit_redirect( CONTACT_PKG_URL );
@@ -22,7 +22,7 @@ if( !empty( $_REQUEST['fCancel'] ) ) {
 }
 
 if( !empty( $_REQUEST['fSaveContact'] ) ) {
-	$_REQUEST['contact_types'] = [ '$00' ];
+	$_REQUEST['contact_types'] = [ 'P01' ];
 	if( $gContent->store( $_REQUEST ) ) {
 		KernelTools::bit_redirect( CONTACT_PKG_URL.'edit.php?content_id='.$gContent->mContentId );
 		die;