Basis: Certvia dev@a48c5fb als Fundament für Craftvia

Unveränderter Stand von certvia/dev (a48c5fb) plus Craftvia-Spezifikation
und Brandbook unter docs/craftvia/. ISMS-Module werden im Folgecommit entfernt.

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

public/site.webmanifest

@@ -0,0 +1,13 @@
+{
+  "name": "Certvia",
+  "short_name": "Certvia",
+  "description": "Informationssicherheit. Endlich einfach.",
+  "theme_color": "#5d52a3",
+  "background_color": "#0e1220",
+  "display": "standalone",
+  "icons": [
+    { "src": "/favicon/pwa-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/favicon/pwa-512.png", "sizes": "512x512", "type": "image/png" },
+    { "src": "/favicon/maskable-512.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}