Add Chinese localization support for Red Alert mod

- Add Chinese translation files (fluent/zh/) for common and ra modules
- Add simhei.ttf font to support Chinese characters
- Update mod.yaml to reference Chinese translation files and font

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mods/ra/fluent/zh/ra.ftl

@@ -0,0 +1,15 @@
+## Metadata
+mod-title = 红色警戒
+mod-windowtitle = OpenRA - 红色警戒
+
+## LogoStripeLoadScreen
+loadscreen-loading = 填充补给箱..., 充电电容器..., 生成样条曲线..., 种植树木..., 建造桥梁..., 帝国崛起..., 编译 EVA..., 建造水晶塔..., 激活天网..., 分裂原子...
+
+## Tilesets
+tileset-desert = 沙漠
+tileset-snow = 雪地
+tileset-temperat = 温带
+tileset-interior = 室内
+
+## SupportPowerTimerWidget
+support-power-timer = { $player } 的 { $support-power }: { $time }