Initial theme scaffolding (v0.0.1)

- Bootstrap 5 CSS/JS integration via Yarn (served locally)
- Dart Sass build pipeline with PostCSS, Autoprefixer, cssnano
- Twig 3.0 via Composer with PSR-4 autoloading
- FSE block theme templates (index, home, single, page, archive, search, 404)
- Template parts (header, footer) and block patterns
- theme.json with Bootstrap 5-aligned design tokens
- Gitea CI/CD workflow for automated release packages
- WordPress i18n support (en_US base, de_CH translation)

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

src/scss/_variables.scss

@@ -0,0 +1,42 @@
+// Bootstrap variable overrides
+// These MUST be defined BEFORE importing Bootstrap's variables
+
+// Colors - matching theme.json palette
+$white:    #FFFFFF;
+$gray-100: #f8f9fa;
+$gray-200: #e9ecef;
+$gray-300: #dee2e6;
+$gray-400: #ced4da;
+$gray-500: #adb5bd;
+$gray-600: #6c757d;
+$gray-700: #495057;
+$gray-800: #343a40;
+$gray-900: #212529;
+$black:    #000000;
+
+$primary:   #0d6efd;
+$secondary: #6c757d;
+$success:   #198754;
+$danger:    #dc3545;
+$warning:   #ffc107;
+$info:      #0dcaf0;
+$light:     $gray-100;
+$dark:      $gray-800;
+
+// Layout
+$container-max-widths: (
+    sm: 540px,
+    md: 720px,
+    lg: 960px,
+    xl: 1140px,
+    xxl: 1320px
+);
+
+// Typography - using system fonts (matching theme.json)
+$font-family-sans-serif: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+
+// Enable dark mode
+$enable-dark-mode: true;
+
+// Enable reduced motion
+$enable-reduced-motion: true;