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/Unit/Module/SearchProviderCollectionTest.php

@@ -5,6 +5,7 @@ namespace MintyPHP\Tests\Unit\Module;
 use MintyPHP\App\Module\ModuleRegistry;
 use MintyPHP\Module\AddressBook\Providers\AddressBookSearchProvider;
 use MintyPHP\Support\SearchConfig;
+use MintyPHP\Tests\Support\AppContainerIsolationTrait;
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -12,18 +13,15 @@ use PHPUnit\Framework\TestCase;
  */
 final class SearchProviderCollectionTest extends TestCase
 {
-    private static ?\MintyPHP\App\AppContainer $originalContainer = null;
+    use AppContainerIsolationTrait;
 
     protected function setUp(): void
     {
-        // Guard against other tests overwriting the global container (e.g. ThemeResolutionTest)
-        if (self::$originalContainer === null) {
-            self::$originalContainer = $GLOBALS['minty_app_container'] ?? null;
-        }
         if (!($GLOBALS['minty_app_container'] ?? null) instanceof \MintyPHP\App\AppContainer
             || !($GLOBALS['minty_app_container'])->has(ModuleRegistry::class)) {
             // Restore the bootstrap container that has the module registry
             $container = require dirname(__DIR__, 3) . '/lib/App/registerContainer.php';
+            $this->pushAppContainer($container);
             setAppContainer($container);
         }
         SearchConfig::resetModuleProviders();
@@ -31,6 +29,7 @@ final class SearchProviderCollectionTest extends TestCase
 
     protected function tearDown(): void
     {
+        $this->restoreAppContainer();
         SearchConfig::resetModuleProviders();
     }