feat: extract bookmarks as standalone module with MintyPHP\Module\Bookmarks namespace

Moves bookmarks from core hardcoding into modules/bookmarks/ as a
fully self-contained module, following the same pattern as addressbook.

Module contributions via platform slots:
- aside.tab_panel: bookmark sidebar panel
- topbar.right_item: bookmark toggle button
- layout.body_end_template: bookmark/group dialogs
- layout.head_style: bookmark CSS (form + sidebar)
- runtime.component: bookmark-save and bookmark-panel (phase: late)
- search.resource_item: bookmarks in global search (user-scoped via {{userId}})

Backend fully in module namespace (MintyPHP\Module\Bookmarks\*):
- Service: BookmarkService, BookmarkServicesFactory, BookmarkRepositoryFactory
- Repository: BookmarkRepository, BookmarkGroupRepository, BookmarkNavigationRepository
- Support: BookmarkUrlNormalizer
- Providers: BookmarksSessionProvider, BookmarksLayoutProvider, BookmarksSearchProvider

Core cleanup:
- Removed all bookmark-specific markup from core templates
- Removed core DI registrations for bookmark services
- Removed core bookmark pages, JS, CSS
- AuthSessionTenantContextService delegates to module SessionProvider

Architecture guards:
- NoBookmarksHardcodingTest: verifies zero bookmark references in core
- testModuleClassesUseModuleNamespace: prevents core namespace leakage

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Support/BookmarkUrlNormalizerTest.php

@@ -1,51 +0,0 @@
-<?php
-
-namespace MintyPHP\Tests\Support;
-
-use MintyPHP\Support\BookmarkUrlNormalizer;
-use PHPUnit\Framework\TestCase;
-
-class BookmarkUrlNormalizerTest extends TestCase
-{
-    public function testCanonicalizeRelativeNormalizesPathAndQueryOrder(): void
-    {
-        $actual = BookmarkUrlNormalizer::canonicalizeRelative('/admin//users/?b=2&a=1');
-
-        $this->assertSame('admin/users?a=1&b=2', $actual);
-    }
-
-    public function testCanonicalizeRelativeSortsMultiValueQueryKeys(): void
-    {
-        $actual = BookmarkUrlNormalizer::canonicalizeRelative('admin/users?roles=2&roles=1&search=max');
-
-        $this->assertSame('admin/users?roles=1&roles=2&search=max', $actual);
-    }
-
-    public function testCanonicalizeRelativeRejectsAbsoluteUrl(): void
-    {
-        $actual = BookmarkUrlNormalizer::canonicalizeRelative('https://example.com/admin/users');
-
-        $this->assertSame('', $actual);
-    }
-
-    public function testCanonicalizeRelativeRemovesFragment(): void
-    {
-        $actual = BookmarkUrlNormalizer::canonicalizeRelative('admin/users?a=1#section-2');
-
-        $this->assertSame('admin/users?a=1', $actual);
-    }
-
-    public function testCanonicalizeRequestUriStripsLocaleBaseAndSortsQuery(): void
-    {
-        $actual = BookmarkUrlNormalizer::canonicalizeRequestUri('/de/admin/users?b=2&a=1', '/de/');
-
-        $this->assertSame('admin/users?a=1&b=2', $actual);
-    }
-
-    public function testCanonicalizeRequestUriHandlesAppBaseAndLocale(): void
-    {
-        $actual = BookmarkUrlNormalizer::canonicalizeRequestUri('/core/de/address-book?tenants=b&tenants=a', '/core/de/');
-
-        $this->assertSame('address-book?tenants=a&tenants=b', $actual);
-    }
-}