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/Support/helpers/ui.php

@@ -482,6 +482,24 @@ function appStylePathsForGroups(array $groupNames): array
         return [];
     }
 
+    // Merge module-contributed style groups (same shape as config/assets.php groups).
+    try {
+        $registry = app(\MintyPHP\App\Module\ModuleRegistry::class);
+        if ($registry instanceof \MintyPHP\App\Module\ModuleRegistry) {
+            foreach ($registry->getAssetGroups() as $groupName => $paths) {
+                if (!is_string($groupName) || $groupName === '') {
+                    continue;
+                }
+                if (!is_array($paths) || isset($groups[$groupName])) {
+                    continue;
+                }
+                $groups[$groupName] = $paths;
+            }
+        }
+    } catch (\Throwable) {
+        // fail-open: no module registry in this runtime context.
+    }
+
     $resolved = [];
     // Used as a fast set to keep insertion order while removing duplicates.
     $seen = [];