feat!: require Shopware 6.7, release as 0.1.0

- shopware/core ~6.7.0; 6.6 stays on the 0.0.x line
- drop the sw-settings navigation entry; the settingsItem card in
  Settings > System is the only entry, like core settings modules
- dev container on dockware/shopware:6.7.14.2

BREAKING CHANGE: Shopware 6.6 is no longer supported.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   shopware:
-    image: dockware/shopware:6.6.10.12
+    image: dockware/shopware:6.7.14.2
     container_name: shopware
     ports:
       - "80:80"       # Shop / Admin / Adminer / Mailcatcher (all served via path on this port)