Add new web-app-mini-qr role

- Introduced new role 'web-app-mini-qr' to deploy the lightweight, self-hosted Mini-QR application.
- Added dedicated subnet and localhost port mapping (8059) in group_vars.
- Ensured proper dependency structure and run_once handling in MIG role.
- Included upstream reference and CSP whitelist for temporary clarity.ms removal tracking.
- Added README.md and meta information following the Infinito.Nexus web-app schema.

See: https://chatgpt.com/share/68f890ab-5960-800f-85f8-ba30bd4350fe

roles/web-app-mini-qr/vars/main.yml

@@ -0,0 +1,12 @@
+# General 
+application_id:                 web-app-mini-qr
+entity_name:                    "{{ application_id | get_entity_name }}"
+
+# Docker
+docker_compose_flush_handlers:  false
+docker_pull_git_repository:     false
+
+# Helper variables
+MINI_QR_IMAGE:                  "ghcr.io/lyqht/mini-qr"
+MINI_QR_VERSION:                "latest"
+MINI_QR_CONTAINER:              "{{ entity_name }}"