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/fragments/artist-list.html

@@ -3,7 +3,7 @@
   <p class="text-lg text-base-content/60">No artists tracked yet</p>
   <p class="text-sm text-base-content/40 mt-2">Search for artists using the search bar above and click "+ Add"</p>
 </div>
-{:else}
+{#else}
 <div class="overflow-x-auto">
   <table class="table table-zebra">
     <thead>