feat: implement core course platform UI and logic

- Add project configuration and git ignore rules
- Implement App router with protected routes
- Develop course player, grid, and card components
- Add state management for course progress and navigation
- Initialize database services for course and comment data

public/favicon.svg

@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none">
+  <defs>
+    <linearGradient id="favOrangeGrad" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#FB923C" />
+      <stop offset="100%" stop-color="#EA580C" />
+    </linearGradient>
+  </defs>
+  <circle cx="50" cy="50" r="48" fill="#121214" />
+  <circle cx="38" cy="40" r="14" fill="url(#favOrangeGrad)" />
+  <circle cx="68" cy="40" r="14" fill="url(#favOrangeGrad)" />
+  <circle cx="53" cy="66" r="14" fill="url(#favOrangeGrad)" />
+</svg>