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>

config/assets.php

@@ -12,6 +12,7 @@ return [
             'shared' => [
                 'css/components/app-badges.css',
                 'css/layout/app-shell.css',
+                'css/components/app-dialog.css',
                 'css/components/app-blockquote.css',
                 'css/components/app-forms.css',
                 'css/components/app-flash.css',
@@ -46,14 +47,10 @@ return [
                 'css/vendor-overrides/editorjs.css',
                 'css/components/app-page-copy.css',
                 'css/layout/app-aside-icon-bar.css',
-                'css/components/app-bookmark-form.css',
             ],
             'login' => [
                 'css/pages/app-login.css',
             ],
-            'address-book' => [
-                'css/pages/address-book-view.css',
-            ],
             'error' => [
                 'css/pages/app-error.css',
             ],