fix: resolve JSON syntax error in i18n locale files

Fixed missing closing braces in the error object of both en.json and zh.json locale files that caused Vite parse errors. The envManager.error object was not properly closed, causing the subsequent skills object to be parsed incorrectly.

src/i18n/locales/en.json

@@ -645,6 +645,8 @@
     },
     "error": {
       "noSelection": "Please select environment variables to delete"
+    }
+  },
   "skills": {
     "manage": "Skills",
     "title": "Claude Skills Management",

src/i18n/locales/zh.json

@@ -645,6 +645,8 @@
     },
     "error": {
       "noSelection": "请选择要删除的环境变量"
+    }
+  },
   "skills": {
     "manage": "Skills",
     "title": "Claude Skills 管理",