Refactor srv-web-7-7-inj-port-ui-desktop to use CDN-served JS file with inline initializer

- Added vars/main.yml to define iframe-handler.js file name and destination
- Implemented 01_deploy.yml to deploy iframe-handler.js to CDN and set mtime-based version fact
- Split original iframe logic into:
  • iframe-handler.js (full logic, served from CDN)
  • iframe-init_one_liner.js.j2 (small inline bootstrap, CSP-hashed)
- Updated head_sub.j2 to load script from CDN instead of embedding full code
- Added body_sub.j2 for inline init code
- Updated iframe-handler.js.j2 with initIframeHandler() function and global exposure
- Activated role earlier in inj-compose with public: true so vars are available for templates
- Included 'port-ui-desktop' in body_snippets loop in location.lua.j2
- Disabled 'port-ui-desktop' feature in web-svc-cdn config by default

https://chatgpt.com/share/689d03a8-4c28-800f-8b06-58ce2807b075

roles/srv-web-7-7-inj-compose/templates/location.lua.j2

@@ -58,7 +58,7 @@ body_filter_by_lua_block {
     -- build a list of body-injection snippets
     local body_snippets = {}
 
-    {% for body_feature in ['matomo', 'logout' ] %}
+    {% for body_feature in ['matomo', 'logout', 'port-ui-desktop'] %}
     {% if applications | get_app_conf(application_id, 'features.' ~ body_feature, false) | bool %}
     body_snippets[#body_snippets + 1] = [=[
         {%- include "roles/srv-web-7-7-inj-" ~ body_feature ~ "/templates/body_sub.j2" -%}