Choose menu anchors, link targets in plugin settings and existing post terms

A menu entry picks its anchor from the linked page, link settings of plugins and own menu
links get page and PDF choice next to the address, and the post settings offer existing
categories and tags to click.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

templates/admin/content-results.html.twig

@@ -66,11 +66,11 @@
                             </div>
                             <div>
                                 <label for="categories-{{ page.id }}">Kategorien</label>
-                                <input id="categories-{{ page.id }}" name="categories" value="{{ page.terms.category }}" placeholder="Projekte, Referenzen">
+                                <input id="categories-{{ page.id }}" name="categories" value="{{ page.terms.category }}" placeholder="Projekte, Referenzen" data-term-input="{{ termNames.category|default([])|json_encode|e('html_attr') }}">
                             </div>
                             <div>
                                 <label for="tags-{{ page.id }}">Schlagwörter</label>
-                                <input id="tags-{{ page.id }}" name="tags" value="{{ page.terms.tag }}" placeholder="WordPress, Migration">
+                                <input id="tags-{{ page.id }}" name="tags" value="{{ page.terms.tag }}" placeholder="WordPress, Migration" data-term-input="{{ termNames.tag|default([])|json_encode|e('html_attr') }}">
                                 <p class="field-help">Mehrere durch Komma trennen. Unbekannte Namen werden angelegt.</p>
                             </div>
                             <div>