refactor: 确立独立子工程架构 (backend, admin, mpuniapp) 并同步更新 AGENTS.md 规范

admin/.stylelintrc

@@ -0,0 +1,17 @@
+{
+  "extends": ["stylelint-config-standard", "stylelint-config-prettier"],
+  "customSyntax": "postcss-less",
+  "rules": {
+    "selector-class-pattern": null,
+    "no-descending-specificity": null,
+    "no-duplicate-selectors": null,
+    "color-function-notation": null,
+    "font-family-no-missing-generic-family-keyword": null,
+    "selector-pseudo-class-no-unknown": [
+      true,
+      {
+        "ignorePseudoClasses": ["global"]
+      }
+    ]
+  }
+}