feat(ui): add locales and split catalogs

Adds Spanish, French, Russian, Japanese, and Simplified Chinese catalogs and wires supported locales into the i18n layer.

packages/ui/src/lib/i18n/messages/zh-Hans/loadingScreen.ts

@@ -0,0 +1,17 @@
+export const loadingScreenMessages = {
+  "loadingScreen.logoAlt": "CodeNomad 徽标",
+  "loadingScreen.status.issue": "遇到问题",
+  "loadingScreen.actions.showAnother": "换一句",
+  "loadingScreen.errors.missingRoot": "未找到加载根元素",
+
+  "loadingScreen.phrases.neurons": "正在热身 AI 神经元…",
+  "loadingScreen.phrases.daydreaming": "正在劝 AI 别再走神…",
+  "loadingScreen.phrases.goggles": "正在擦亮 AI 的代码护目镜…",
+  "loadingScreen.phrases.reorganizingFiles": "正在请求 AI 别再帮你重排文件…",
+  "loadingScreen.phrases.coffee": "正在给 AI 加杯咖啡…",
+  "loadingScreen.phrases.nodeModules": "正在教 AI 别再删除 node_modules（又一次）…",
+  "loadingScreen.phrases.actNatural": "正在提醒 AI 在你到来前表现自然点…",
+  "loadingScreen.phrases.rewritingHistory": "正在请 AI 别再重写历史…",
+  "loadingScreen.phrases.stretch": "正在让 AI 在编码冲刺前伸个懒腰…",
+  "loadingScreen.phrases.keyboardControl": "正在说服 AI 把键盘控制权交给你…",
+} as const