feat: 导航收藏网站 v1.0

功能:
- 网站收藏管理（添加/编辑/删除/收藏）
- 分类管理（支持自定义图标和颜色）
- 搜索功能
- 点击统计
- 现代暗色主题 UI

技术栈:
- 后端: Python Flask + MySQL
- 前端: React + Vite + Tailwind CSS
- 数据库: MySQL (192.168.8.160)
- 端口: 后端 5003, 前端 5173

frontend/node_modules/axios/lib/platform/common/utils.js

@@ -0,0 +1,52 @@
+const hasBrowserEnv = typeof window !== 'undefined' && typeof document !== 'undefined';
+
+const _navigator = (typeof navigator === 'object' && navigator) || undefined;
+
+/**
+ * Determine if we're running in a standard browser environment
+ *
+ * This allows axios to run in a web worker, and react-native.
+ * Both environments support XMLHttpRequest, but not fully standard globals.
+ *
+ * web workers:
+ *  typeof window -> undefined
+ *  typeof document -> undefined
+ *
+ * react-native:
+ *  navigator.product -> 'ReactNative'
+ * nativescript
+ *  navigator.product -> 'NativeScript' or 'NS'
+ *
+ * @returns {boolean}
+ */
+const hasStandardBrowserEnv =
+  hasBrowserEnv &&
+  (!_navigator || ['ReactNative', 'NativeScript', 'NS'].indexOf(_navigator.product) < 0);
+
+/**
+ * Determine if we're running in a standard browser webWorker environment
+ *
+ * Although the `isStandardBrowserEnv` method indicates that
+ * `allows axios to run in a web worker`, the WebWorker will still be
+ * filtered out due to its judgment standard
+ * `typeof window !== 'undefined' && typeof document !== 'undefined'`.
+ * This leads to a problem when axios post `FormData` in webWorker
+ */
+const hasStandardBrowserWebWorkerEnv = (() => {
+  return (
+    typeof WorkerGlobalScope !== 'undefined' &&
+    // eslint-disable-next-line no-undef
+    self instanceof WorkerGlobalScope &&
+    typeof self.importScripts === 'function'
+  );
+})();
+
+const origin = (hasBrowserEnv && window.location.href) || 'http://localhost';
+
+export {
+  hasBrowserEnv,
+  hasStandardBrowserWebWorkerEnv,
+  hasStandardBrowserEnv,
+  _navigator as navigator,
+  origin,
+};