feat: initial commit for media tracking software

- Setup C++/Qt6 desktop application structure
- Added initial Go proxy backend for TMDB/IGDB integration

resources/icons/appicon.svg

@@ -0,0 +1,16 @@
+<svg width="512" height="512" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#0a84ff"/>
+      <stop offset="0.5" stop-color="#bf5af2"/>
+      <stop offset="1" stop-color="#ff375f"/>
+    </linearGradient>
+  </defs>
+  <rect x="32" y="32" width="448" height="448" rx="112" fill="url(#bg)"/>
+  <!-- play triangle -->
+  <path d="M196 168 L196 344 L344 256 Z" fill="#ffffff"/>
+  <!-- checklist tick badge -->
+  <circle cx="356" cy="356" r="86" fill="#ffffff"/>
+  <path d="M318 356 L346 384 L398 326" fill="none" stroke="#30d158"
+        stroke-width="26" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>