refactor: replace feature globals with typed services

src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/background-decode.test.mjs

@@ -38,9 +38,10 @@ test("background decode loads configuration for the explicitly selected rig", as
   const source = await readFile(new URL("../../assets/web/generated/background-decode.js", import.meta.url), "utf8");
   new vm.Script(source).runInContext(context);
 
-  window.initBackgroundDecode("rig/a", "control");
+  window.trx.modules.backgroundDecode.initialize("rig/a", "control");
   await new Promise((resolve) => setTimeout(resolve, 0));
   assert.ok(requested.includes("/background-decode/rig%2Fa"));
   assert.ok(requested.includes("/bookmarks"));
   assert.ok(requested.includes("/background-decode/rig%2Fa/status"));
+  assert.equal(window.initBackgroundDecode, undefined);
 });