feat: enhance Electron environment detection and improve database warnings

electron/preload.js

@@ -1,8 +1,28 @@
 const { contextBridge } = require('electron');
 
+// 获取数据目录路径（用于显示给用户）
+// 使用字符串拼接而不是 path.join 避免模块依赖问题
+function getDataDirPath() {
+  const platform = process.platform;
+  const homeDir = process.env.HOME || process.env.USERPROFILE || '';
+  
+  switch (platform) {
+    case 'darwin':
+      return `${homeDir}/Library/Application Support/New API/data`;
+    case 'win32':
+      const appData = process.env.APPDATA || `${homeDir}\\AppData\\Roaming`;
+      return `${appData}\\New API\\data`;
+    case 'linux':
+      return `${homeDir}/.config/New API/data`;
+    default:
+      return `${homeDir}/.new-api/data`;
+  }
+}
+
 contextBridge.exposeInMainWorld('electron', {
   isElectron: true,
   version: process.versions.electron,
   platform: process.platform,
-  versions: process.versions
+  versions: process.versions,
+  dataDir: getDataDirPath()
 });