feat: rebuild site content management

Replace legacy FAQ, downloads, and release flows with project and blog publishing. Add configurable branding and theme fields plus clean-start Compose seeding support.

templates/pages/home.html

@@ -2,7 +2,7 @@
 {% load static %}
 
 {% block title %}Home{% endblock %}
-{% block meta_description %}Communication to Care — A Powerful Workflow Generator for Standardized Radiomics Analysis and Medical Image Visualization.{% endblock %}
+{% block meta_description %}{{ site_branding.meta_description }}{% endblock %}
 
 {% block content %}
 
@@ -38,7 +38,7 @@
     <div class="hero-app-preview fade-in">
       <div class="hero-app-preview-glow" aria-hidden="true"></div>
       {% if site_branding.hero_logo %}
-      <img src="{{ site_branding.hero_logo.url }}" alt="{{ site_branding.hero_logo_alt|default:'Communication to Care' }}" loading="eager" />
+      <img src="{{ site_branding.hero_logo.url }}" alt="{{ site_branding.hero_logo_alt|default:site_branding.site_name }}" loading="eager" />
       {% elif hero and hero.image %}
       <img src="{{ hero.image.url }}" alt="{{ hero.image_alt }}" loading="eager" />
       {% else %}