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/users.js

@@ -0,0 +1,28 @@
+ const users = []
+
+ const addUser = ({id, name, room}) => {
+    const numberOfUsersInRoom = users.filter(user => user.room === room).length
+    if(numberOfUsersInRoom === 2)
+    return { error: 'Room full' }
+
+    const newUser = { id, name, room }
+    users.push(newUser)
+    return { newUser }
+}
+
+const removeUser = id => {
+    const removeIndex = users.findIndex(user => user.id === id)
+
+    if(removeIndex!==-1)
+        return users.splice(removeIndex, 1)[0]
+}
+
+const getUser = id => {
+    return users.find(user => user.id === id)
+}
+
+const getUsersInRoom = room => {
+    return users.filter(user => user.room === room)
+}
+
+module.exports = { addUser, removeUser, getUser, getUsersInRoom }