fix(i18n): 繁中開屏 consent 文案不生效 - 寫死繁中文案、清理腳本、文件

- splash: 繁中 consent 使用元件內 ZH_TW_CONSENT，避免 bundle 快取
- splash: 使用 isTraditionalChineseLocaleTag 判斷繁中
- i18n: 註解與 __DEV__ debug log
- package: clean:cache, start:clean, ios:clean, clean:ios-build
- ALL_COPY: 故障排除與 consent 只改 zh-TW.json 說明
- spec_kit: Splash Consent overflow 記錄排查結論

Co-authored-by: Cursor <cursoragent@cursor.com>

client/package.json

@@ -4,10 +4,14 @@
   "version": "1.0.0",
   "scripts": {
     "start": "expo start",
+    "start:clean": "expo start -c",
     "android": "expo run:android",
     "ios": "expo run:ios --scheme \"Hey Mama\"",
+    "ios:clean": "npm run clean:cache && npm run clean:ios-build && expo run:ios --scheme \"Hey Mama\"",
     "web": "expo start --web",
-    "test": "vitest run"
+    "test": "vitest run",
+    "clean:cache": "rm -rf node_modules/.cache .expo 2>/dev/null; echo 'Cleared .expo and node_modules/.cache'",
+    "clean:ios-build": "rm -rf ~/Library/Developer/Xcode/DerivedData/client-* 2>/dev/null; echo 'Cleared Xcode DerivedData for client'"
   },
   "dependencies": {
     "@expo/vector-icons": "^15.0.3",