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/Architecture/CoreTemplateIsolationTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace MintyPHP\Tests\Architecture;
+
+use FilesystemIterator;
+use PHPUnit\Framework\TestCase;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+
+final class CoreTemplateIsolationTest extends TestCase
+{
+    public function testCoreTemplatesDoNotReferenceModuleSpecificLayoutNavKeys(): void
+    {
+        $projectRoot = dirname(__DIR__, 2);
+        $templatesDir = $projectRoot . '/templates';
+        $modulesDir = $projectRoot . '/modules';
+
+        if (!is_dir($templatesDir) || !is_dir($modulesDir)) {
+            self::markTestSkipped('templates/ or modules/ directory missing.');
+        }
+
+        $moduleIds = [];
+        foreach (scandir($modulesDir) ?: [] as $entry) {
+            if ($entry === '.' || $entry === '..') {
+                continue;
+            }
+            if (!is_dir($modulesDir . '/' . $entry)) {
+                continue;
+            }
+            $moduleIds[] = $entry;
+        }
+
+        $violations = [];
+        $iterator = new RecursiveIteratorIterator(
+            new RecursiveDirectoryIterator($templatesDir, FilesystemIterator::SKIP_DOTS),
+            RecursiveIteratorIterator::LEAVES_ONLY
+        );
+
+        foreach ($iterator as $file) {
+            if ($file->getExtension() !== 'phtml') {
+                continue;
+            }
+            $path = $file->getPathname();
+            $content = file_get_contents($path);
+            if (!is_string($content)) {
+                continue;
+            }
+
+            foreach ($moduleIds as $moduleId) {
+                if (preg_match("/layoutNav\[['\"]" . preg_quote($moduleId, '/') . "(\\.|['\"])" . "/", $content) === 1) {
+                    $violations[] = str_replace($projectRoot . '/', '', $path) . ' references layoutNav module key for ' . $moduleId;
+                }
+            }
+        }
+
+        self::assertSame([], $violations, "Core templates reference module layout keys:\n" . implode("\n", $violations));
+    }
+}