创建群，拉假人入群

src/main/java/com/tailbet/service/impl/FakeUserServiceImpl.java

@@ -174,4 +174,18 @@ public class FakeUserServiceImpl implements IFakeUserService {
                 .eq(User::getIsFake, 1)
                 .eq(User::getStatus, 1));
     }
+
+    /**
+     * 从现有假人中随机挑选指定数量
+     */
+    @Override
+    public List<User> pickFakeUsers(int count) {
+        List<User> fakes = getFakeUsers();
+        if (fakes.isEmpty()) {
+            return List.of();
+        }
+        Collections.shuffle(fakes, RANDOM);
+        int size = Math.min(count, fakes.size());
+        return new ArrayList<>(fakes.subList(0, size));
+    }
 }