add: absorb uno-online as regular subdirectory

UNO card game web app (Node.js/React) with Miku bot integration.
Previously an independent git repo (fork of mizanxali/uno-online).
Removed .git/ and absorbed into main repo for unified tracking.

Includes bot integration code: botActionExecutor, cardParser,
gameStateBuilder, and server-side bot action support.
37 files, node_modules excluded via local .gitignore.

uno-online/client/src/index.css

@@ -0,0 +1,14 @@
+@import url('https://fonts.googleapis.com/css?family=Carter+One');
+
+* {
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  margin: 0;
+  font-family: 'Carter One', sans-serif;
+  color: white;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}