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>

src/main/resources/templates/fragments/feed-entries.html

@@ -3,7 +3,7 @@
   <p class="text-lg text-base-content/60">No releases found</p>
   <p class="text-sm text-base-content/40 mt-2">Add artists to your collection to see their releases here</p>
 </div>
-{:else}
+{#else}
 <div class="overflow-x-auto">
   <table class="table table-zebra">
     <thead>

src/main/resources/templates/fragments/search-results.html

@@ -1,7 +1,7 @@
 <div class="card bg-base-100 shadow-xl mt-1 max-h-64 overflow-y-auto">
   {#if artists.isEmpty()}
     <div class="p-3 text-sm text-base-content/60">No artists found</div>
-  {:else}
+  {#else}
     {#for artist in artists}
     <div class="flex items-center justify-between p-3 hover:bg-base-200 border-b border-base-200 last:border-b-0">
       <div class="flex-1 min-w-0">
@@ -15,7 +15,7 @@
       <div class="ml-2 flex-shrink-0">
         {#if artist.alreadyTracked}
           <span class="badge badge-success badge-sm">✓ Added</span>
-        {:else}
+        {#else}
           <button class="btn btn-primary btn-xs"
                   hx-post="/api/artists/{artist.mbid}/track"
                   hx-target="#artist-list"

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">