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>

lib/Service/Access/UiAccessService.php

@@ -80,11 +80,28 @@ final class UiAccessService
     }
 
     /**
+     * Resolve layout capabilities from Core + module-contributed capabilities.
+     *
      * @return array<string, bool>
      */
     public function layoutCapabilities(int $actorUserId): array
     {
-        return $this->resolveMap($actorUserId, UiCapabilityMap::LAYOUT);
+        $map = UiCapabilityMap::LAYOUT;
+
+        // Merge module-contributed layout capabilities dynamically.
+        try {
+            /** @var \MintyPHP\App\Module\ModuleRegistry $registry */
+            $registry = app(\MintyPHP\App\Module\ModuleRegistry::class);
+            if ($registry instanceof \MintyPHP\App\Module\ModuleRegistry) {
+                foreach ($registry->getLayoutCapabilities() as $key => $ability) {
+                    $map[$key] = $ability;
+                }
+            }
+        } catch (\Throwable) {
+            // fail-open: no module registry available in this context
+        }
+
+        return $this->resolveMap($actorUserId, $map);
     }
 
     /**