Fix build and runtime issues

- Fix Quarkus BOM groupId (io.quarkus:quarkus-bom) and version (3.37.1)
- Fix artifact names: quarkus-resteasy, quarkus-resteasy-qute, quarkus-resteasy-client
- Add UserAgentFilter for MusicBrainz API compliance
- Fix @RestClient qualifier on MB client injection points
- Fix Qute template section names: {#insert}{/insert}, {#else} not {:else}
- Fix template injection with @Location annotation
- Remove unused imports
- Fix RSS feed builder to use Synd API

src/main/resources/templates/layouts/base.html

@@ -56,7 +56,7 @@
   </div>
 
   <main class="container mx-auto p-4">
-    {#insert page-content}{/page-content}
+    {#insert page-content}{/insert}
   </main>
 
   <dialog id="settingsModal" class="modal">