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/tasks/01_core.yml

@@ -0,0 +1,7 @@
+- name: "load docker, proxy for '{{ application_id }}'"
+  include_role:
+    name: sys-stk-full-stateless
+  vars: 
+    docker_compose_flush_handlers: false
+
+- include_tasks: utils/run_once.yml

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

@@ -0,0 +1,4 @@
+---
+- include_tasks: 01_core.yml
+  when: run_once_web_app_mini_qr is not defined
+