music(player): 变速播放 + AB Loop

- 变速：底部 1× 圆形按钮循环切 0.5/0.75/1/1.25/1.5；preservesPitch=true（浏览器 native 保音高）；localStorage 持久化全局
- AB Loop：A B 两按钮在当前位置打点，🔁 开关；进度条上绿色高亮 A↔B 区段；timeupdate 触发 ≥B 跳回 A；切歌自动清 A/B

apps/werewolf/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "werewolf"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+description = "werewolf.famzheng.me — 狼人杀单机发牌器（一台手机轮流传），从 partiverse 移植"
+
+[dependencies]
+cube-core = { path = "../../crates/cube-core" }
+tokio = { workspace = true }