refactor: align addressbook module to MintyPHP\Module\AddressBook namespace

Migrates addressbook service classes from core namespace
(MintyPHP\Service\AddressBook\*) to proper module namespace
(MintyPHP\Module\AddressBook\Service\*), consistent with the
bookmarks module pattern.

Moved to module:
- AddressBookService → modules/addressbook/lib/Module/AddressBook/Service/
- AddressBookServicesFactory → modules/addressbook/lib/Module/AddressBook/Service/
- AddressBookServiceTest → modules/addressbook/tests/Module/AddressBook/Service/
- Pages, templates, CSS, JS all in module directory

All module PHP classes now live under MintyPHP\Module\<Name>\*,
enforced by ModuleStructureContractTest::testModuleClassesUseModuleNamespace.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Architecture/NoAddressBookHardcodingTest.php

@@ -14,9 +14,7 @@ use FilesystemIterator;
  * Intentionally allowed in Core (not flagged):
  * - PermissionService::ADDRESS_BOOK_VIEW (general people-visibility gate)
  * - OperationsAuthorizationPolicy / UiCapabilityMap / UserAuthorizationPolicy (authorization)
- * - AddressBookService / AddressBookServicesFactory (business logic, V1 shared-db)
- * - pages/address-book/* (page files, not hardcoded integrations)
- * - config/assets.php (asset pipeline not yet modular)
+ * - modules/addressbook/* (module-owned runtime, pages/assets/providers)
  * - i18n translation files
  * - Module directory (lib/Module/, modules/)
  * - Test files
@@ -90,10 +88,7 @@ final class NoAddressBookHardcodingTest extends TestCase
     }
 
     /**
-     * Aside panel template must not have hardcoded People panel.
-     *
-     * Note: The search panel legitimately contains data-search-key="address-book"
-     * for the global search results — that is NOT a hardcoded People panel.
+     * Aside panel template must not have hardcoded People panel/search entries.
      */
     public function testAsideHasNoHardcodedPeoplePanel(): void
     {
@@ -116,6 +111,20 @@ final class NoAddressBookHardcodingTest extends TestCase
             $content,
             'Aside still defines $peopleGroups as a standalone variable'
         );
+        self::assertStringNotContainsString(
+            'data-search-key="address-book"',
+            $content,
+            'Aside still has static address-book search item markup'
+        );
+    }
+
+    public function testCoreNoLongerContainsAddressBookServiceDirectory(): void
+    {
+        $coreServiceDir = dirname(__DIR__, 2) . '/lib/Service/AddressBook';
+        self::assertDirectoryDoesNotExist(
+            $coreServiceDir,
+            'Addressbook service classes should live in modules/addressbook/lib, not in Core lib/Service'
+        );
     }
 
     /**