refactor(web-app-shopware): externalize trusted proxy and host configuration with mounted framework.yaml

- added new file roles/web-app-shopware/files/framework.yaml defining trusted_proxies and trusted_headers for Symfony
 - mounted framework.yaml into /var/www/html/config/packages/ in docker-compose
 - exposed new role vars SHOPWARE_FRAMEWORK_HOST/DOCKER for mounting path
 - rendered framework.yaml via Ansible copy task with proper permissions
 - adjusted env.j2 to set TRUSTED_PROXIES and TRUSTED_HOSTS dynamically from domains and networks
 - added SHOPWARE_DOMAIN var to vars/main.yml
 - removed inline framework.yaml creation from Dockerfile (now managed via mount)
 - updated proxy template (html.conf.j2) to include X-Forwarded-Ssl header
 - improved init.sh permission handling for shared volumes

See ChatGPT conversation for implementation details and rationale:
https://chatgpt.com/share/690d4fe7-2830-800f-8b6d-b868e7fe0e97

roles/web-app-shopware/tasks/main.yml

@@ -14,6 +14,14 @@
     - docker compose up
     - docker compose build
 
+- name: "Render framework.yaml (trusted proxies/headers/hosts)"
+  copy:
+    src:  "framework.yaml"
+    dest: "{{ SHOPWARE_FRAMEWORK_HOST }}"
+    mode: "0644"
+  notify:
+    - docker compose up
+
 - name: "Flush docker compose handlers"
   meta: flush_handlers