feat(tun): support mips stack from mihomo v1.19.31

Add `mips` to the TUN stack switch so the stack shipped in mihomo
v1.19.31 is selectable from the GUI. Older cores reject the value,
which the changelog entry discloses.

Changelog.md

@@ -61,6 +61,7 @@
 - 新增代理页排查提示，方便检查订阅和内核状态
 - 新增订阅更新频率提醒，间隔不足 24 小时时提示
 - 新增启动失败提示，显示原因并保存启动日志
+- 新增 TUN「Mips」堆栈选项，需配合 mihomo v1.19.31 及以上内核
 
 **🍎 macOS**
 

src/components/setting/mods/stack-mode-switch.tsx

@@ -31,6 +31,13 @@ export const StackModeSwitch = (props: Props) => {
       >
         Mixed
       </Button>
+      <Button
+        variant={value?.toLowerCase() === 'mips' ? 'contained' : 'outlined'}
+        onClick={() => onChange?.('mips')}
+        sx={{ textTransform: 'capitalize' }}
+      >
+        Mips
+      </Button>
     </ButtonGroup>
   )
 }