feat: extend module platform with UI slots, runtime components, CLI tooling and {{userId}} search support

Completes the generic module platform that enables modules to contribute
UI elements, runtime JS components, and search resources without any
core hardcoding.

New generic UI slot types:
- topbar.right_item: module-contributed topbar buttons
- layout.body_end_template: module-contributed dialog/overlay templates
- layout.head_style: module-contributed global CSS
- runtime.component: declarative JS component registration with phase ordering

New infrastructure:
- ModuleAutoloader: PSR-4 autoloading for module-local PHP classes
- ModuleRuntimePageBuilder: symlinks module pages into runtime directory
- ModuleRuntimeAssetPublisher: publishes module CSS/JS to web/modules/
- ModulePermissionSynchronizer: syncs module permissions to DB
- CLI scripts: module-runtime-sync, module-build, module-migrate,
  module-permissions-sync, module-assets-sync
- {{userId}} placeholder in SearchDataService for user-scoped search queries
- Component runtime with phased initialization (early/default/late)
- AppContainer.protectExistingBindings() to prevent module→core overwrites
- Architecture tests: ModuleStructureContractTest, CoreTemplateIsolationTest,
  FrontendComponentRuntimeContractTest, AppContainerIsolationContractTest

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

tests/Support/ThemeResolutionTest.php

@@ -5,10 +5,13 @@ namespace MintyPHP\Tests\Support;
 use MintyPHP\App\AppContainer;
 use MintyPHP\Service\Settings\SettingCacheService;
 use MintyPHP\Service\Settings\ThemeConfigGateway;
+use MintyPHP\Tests\Support\AppContainerIsolationTrait;
 use PHPUnit\Framework\TestCase;
 
 class ThemeResolutionTest extends TestCase
 {
+    use AppContainerIsolationTrait;
+
     private AppContainer $container;
 
     protected function setUp(): void
@@ -23,11 +26,12 @@ class ThemeResolutionTest extends TestCase
 
         $this->setAppSettings([]);
 
-        $GLOBALS['minty_app_container'] = $this->container;
+        $this->pushAppContainer($this->container);
     }
 
     protected function tearDown(): void
     {
+        $this->restoreAppContainer();
         $_SESSION = [];
     }