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-mig/tasks/01_core.yml

@@ -23,3 +23,5 @@
 - name: Build data (single async task)
   include_tasks: 02_build_data.yml
   when: MIG_BUILD_DATA | bool
+
+- include_tasks: utils/run_once.yml

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

@@ -1,7 +1,4 @@
 ---
-- block: 
-  - include_tasks: 01_core.yml
-  - include_tasks: utils/run_once.yml
-  name: "Setup Meta Infinite Graph"
+- include_tasks: 01_core.yml
   when: run_once_web_app_mig is not defined