v0.1.1 - Bootstrap frontend rendering via Twig templates

Replace FSE block markup on the frontend with proper Bootstrap 5 HTML
rendered through Twig templates. The Site Editor remains functional for
admin editing while the public site outputs Bootstrap navbar, cards,
pagination, grid layout, and responsive components.

New PHP classes: TemplateController, ContextBuilder, NavWalker
New Twig templates: 20 files (base, pages, partials, components)
Enhanced TwigService with WordPress functions and globals

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

views/partials/post-navigation.html.twig

@@ -0,0 +1,22 @@
+{% if post_navigation is defined and post_navigation|length > 0 %}
+<nav class="border-top border-bottom py-4 my-4" aria-label="{{ __('Post navigation') }}">
+    <div class="row">
+        <div class="col-6">
+            {% if post_navigation.previous is defined %}
+                <small class="text-body-secondary d-block mb-1">{{ __('Previous') }}</small>
+                <a href="{{ post_navigation.previous.url }}" class="text-decoration-none">
+                    &larr; {{ post_navigation.previous.title }}
+                </a>
+            {% endif %}
+        </div>
+        <div class="col-6 text-end">
+            {% if post_navigation.next is defined %}
+                <small class="text-body-secondary d-block mb-1">{{ __('Next') }}</small>
+                <a href="{{ post_navigation.next.url }}" class="text-decoration-none">
+                    {{ post_navigation.next.title }} &rarr;
+                </a>
+            {% endif %}
+        </div>
+    </div>
+</nav>
+{% endif %}