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/components/card-post-grid.html.twig

@@ -0,0 +1,17 @@
+<article class="card h-100">
+    {% if post.thumbnail %}
+        <a href="{{ post.url }}">
+            <img src="{{ post.thumbnail }}" class="card-img-top"
+                 alt="{{ post.title|e('html_attr') }}"
+                 style="aspect-ratio: 3/2; object-fit: cover;">
+        </a>
+    {% endif %}
+    <div class="card-body">
+        <h3 class="card-title h6">
+            <a href="{{ post.url }}" class="text-decoration-none text-body">{{ post.title }}</a>
+        </h3>
+        <p class="card-text text-body-secondary small">
+            <time datetime="{{ post.date_iso }}">{{ post.date }}</time>
+        </p>
+    </div>
+</article>