feat(skills): 添加 check-i18n-keys 技能并补全多语言 key

- 按 Cursor Agent Skills 规范：技能目录含 SKILL.md 与 scripts/
- 多语言检查脚本：扫描 t() 引用，对比 zh-CN/zh-TW/en common.json
- 补全缺失 key：common.create/copy/copySuccess/copyFailed、
  leaderList.openDetailFailed、leaderDetail.market、
  filteredOrdersList.orderDetails、filteredOrdersList.filterTypes.keywordFilter

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

.cursor/skills/frontend/check-i18n-keys/scripts/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "cursor-skill-frontend-scripts",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "check-i18n": "tsx check-i18n-keys.ts"
+  },
+  "dependencies": {
+    "glob": "^13.0.1"
+  },
+  "devDependencies": {
+    "@types/node": "^20.10.0",
+    "tsx": "^4.7.0",
+    "typescript": "^5.3.0"
+  }
+}