将 web-admin 从子模块改为仓库内普通目录，便于单仓克隆与维护。

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

web-admin/.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+  "recommendations": [
+    "vue.volar",
+    "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode",
+    "stylelint.vscode-stylelint",
+    "lokalise.i18n-ally",
+    "bradlc.vscode-tailwindcss"
+  ]
+}