feat: initial qobuz-qt source

Lightweight Qt6 desktop client for Qobuz with a Rust audio backend
(Symphonia/CPAL via staticlib FFI). Mirrors the spotify-qt layout:
toolbar with playback controls, library/context docks on the left,
tabbed search side panel on the right, queue panel, now-playing dock.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

res/icons/data-information.svg

@@ -0,0 +1,9 @@
+<svg version="1.1" viewBox="0 0 22 22" xmlns="http://www.w3.org/2000/svg">
+    <style type="text/css" id="current-color-scheme">
+        .ColorScheme-Highlight {
+            color:#3daee9;
+        }
+    </style>
+    <rect class="ColorScheme-Highlight" x="3" y="3" width="16" height="16" rx="2" fill="currentColor"/>
+    <path d="m10 6v2h2v-2zm0 4v6h2v-6z" fill="#fff"/>
+</svg>