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>

modules/bookmarks/web/css/components/app-bookmark-form.css

@@ -0,0 +1,115 @@
+/**
+ * app-bookmark-form.css
+ * Styles for bookmark and bookmark-group dialogs.
+ */
+@layer components {
+  dialog[data-app-bookmark-dialog] > article.app-bookmark-dialog,
+  dialog[data-app-bookmark-group-dialog] > article.app-bookmark-dialog {
+    max-width: 24rem;
+  }
+
+  dialog[data-app-bookmark-dialog] > article.app-bookmark-dialog > header,
+  dialog[data-app-bookmark-group-dialog] > article.app-bookmark-dialog > header {
+    position: relative;
+    padding-inline-end: 2rem;
+  }
+
+  dialog[data-app-bookmark-dialog] > article.app-bookmark-dialog > header h2,
+  dialog[data-app-bookmark-group-dialog] > article.app-bookmark-dialog > header h2 {
+    margin: 0;
+  }
+
+  dialog[data-app-bookmark-dialog] [data-bookmark-dialog-close].close,
+  dialog[data-app-bookmark-group-dialog] [data-bookmark-group-dialog-close].close {
+    position: absolute;
+    inset-inline-end: 1rem;
+    inset-block-start: 1rem;
+    float: none;
+    margin: 0;
+  }
+
+  dialog[data-app-bookmark-dialog] form,
+  dialog[data-app-bookmark-group-dialog] form {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    margin: 0;
+  }
+
+  dialog[data-app-bookmark-dialog] form label,
+  dialog[data-app-bookmark-group-dialog] form label {
+    font-size: 0.85rem;
+    font-weight: 600;
+    margin: 0;
+  }
+
+  dialog[data-app-bookmark-dialog] form input[type="text"],
+  dialog[data-app-bookmark-dialog] form select,
+  dialog[data-app-bookmark-group-dialog] form input[type="text"],
+  dialog[data-app-bookmark-group-dialog] form select {
+    width: 100%;
+    margin: 0;
+  }
+
+  dialog[data-app-bookmark-dialog] form footer,
+  dialog[data-app-bookmark-group-dialog] form footer {
+    padding-top: var(--app-spacing);
+  }
+
+  .app-bookmark-delete-btn {
+    color: var(--app-del-color, #c62828);
+    border-color: var(--app-del-color, #c62828);
+    width: 100%;
+  }
+
+  .app-bookmark-delete-btn:hover {
+    background: var(--app-del-color, #c62828);
+    color: #fff;
+  }
+
+  .app-bookmark-new-group-btn {
+    width: 100%;
+  }
+
+  .app-bookmark-group-icon-picker {
+    display: grid;
+    grid-template-columns: repeat(7, minmax(0, 1fr));
+    gap: 0.3rem;
+  }
+
+  .app-bookmark-group-icon-option {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 100%;
+    aspect-ratio: 1 / 1;
+    min-height: 1.9rem;
+    border: 1px solid var(--app-border);
+    border-radius: var(--app-border-radius);
+    background: transparent;
+    color: var(--app-muted-color);
+    cursor: pointer;
+    padding: 0;
+    margin: 0;
+    transition: border-color 120ms ease, color 120ms ease;
+  }
+
+  .app-bookmark-group-icon-option:hover {
+    border-color: var(--app-primary);
+    color: var(--app-primary);
+  }
+
+  .app-bookmark-group-icon-option.app-bookmark-icon-active {
+    border-color: var(--app-primary);
+    background: var(--app-primary);
+    color: #fff;
+  }
+
+  .app-bookmark-group-icon-option > i {
+    font-size: 0.95rem;
+  }
+
+  .app-bookmark-delete-separator {
+    margin-block: 0.2rem 0.35rem;
+  }
+}