feat(frontend): rename inj roles to sys-front-*, add sys-svc-cdn, cache-busting lookup

Introduce sys-svc-cdn (cdn_paths/cdn_urls/cdn_dirs) and ensure CDN directories + latest symlink.

Rename sys-srv-web-inj-* → sys-front-inj-*; update includes/templates; serve shared/per-app CSS & JS via CDN.

Add lookup_plugins/local_mtime_qs.py for mtime-based cache busting; split CSS into default.css/bootstrap.css + optional per-app style.css.

CSP: use style-src-elem; drop unsafe-inline for styles. Services: fix SYS_SERVICE_ALL_ENABLED bool and controlled flush.

BREAKING CHANGE: role names changed; replace includes and references accordingly.

Conversation: https://chatgpt.com/share/68b55494-9ec4-800f-b559-44707029141d

roles/sys-front-inj-desktop/templates/iframe-handler.js.j2

@@ -0,0 +1,57 @@
+(function (global) {
+  /**
+   * Initializes the iframe sync & external link forcing logic.
+   * @param {string} primary_domain
+   * @param {string} current_domain
+   * @param {string} allowedOrigin - Parent origin for postMessage
+   */
+  function initIframeHandler(primary_domain, current_domain, allowedOrigin) {
+    function notifyParent() {
+      if (window.self !== window.top) {
+        try {
+          window.parent.postMessage(
+            { type: "iframeLocationChange", href: window.location.href },
+            allowedOrigin
+          );
+        } catch (e) {}
+      }
+    }
+
+    function forceExternalLinks() {
+      Array.prototype.forEach.call(document.querySelectorAll("a[href]"), function (a) {
+        try {
+          var url = new URL(a.href, location);
+          // open new tab if link goes outside our primary OR current domain
+          if (!(url.hostname.endsWith(primary_domain) || url.hostname.endsWith(current_domain))) {
+            a.target = "_blank";
+            a.rel = "noopener";
+          }
+        } catch (e) {}
+      });
+    }
+
+    window.addEventListener("load", function () {
+      notifyParent();
+      forceExternalLinks();
+    });
+    window.addEventListener("popstate", function () {
+      notifyParent();
+      forceExternalLinks();
+    });
+
+    // SPA support
+    var _pushState = history.pushState;
+    history.pushState = function () {
+      _pushState.apply(history, arguments);
+      notifyParent();
+      forceExternalLinks();
+    };
+
+    {% if MODE_DEBUG | bool %}
+    try { console.log("[iframe-sync] initIframeHandler installed."); } catch (e) {}
+    {% endif %}
+  }
+
+  // expose for inline bootstrap
+  global.initIframeHandler = initIframeHandler;
+})(window);