feat(ios): 添加用户信息存储和设置功能

实现用户信息的存储和设置功能，包括添加_userInfo属性和setUserInfo方法
完善getUserInfo方法以返回存储的用户信息

src/ios/ShutoApi.m

@@ -6,11 +6,14 @@
 @interface ShutoApi : CDVPlugin <NSObject> {
   // 保存事件回调ID
   NSString* _eventCallbackId;
+  // 保存用户信息
+  NSDictionary* _userInfo;
 }
 
 - (void)close:(CDVInvokedUrlCommand*)command;
 - (void)registerEvent:(CDVInvokedUrlCommand*)command;
 - (void)getUserInfo:(CDVInvokedUrlCommand*)command;
+- (void)setUserInfo:(CDVInvokedUrlCommand*)command;
 - (void)navigateToRoute:(NSString*)route parameters:(NSDictionary*)parameters __attribute__((objc_method_family(none)));
 @end
 
@@ -68,11 +71,28 @@
 
 - (void)getUserInfo:(CDVInvokedUrlCommand*)command
 {
-    // TODO: Implement getUserInfo method
-    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK];
+    // 返回存储的用户信息
+    CDVPluginResult* pluginResult;
+    if (_userInfo) {
+        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsDictionary:_userInfo];
+    } else {
+        // 用户信息为空时返回空对象
+        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsDictionary:nil];
+    }
     [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
 }
 
+- (void)setUserInfo:(NSDictionary*)userInfo
+{
+    // 设置用户信息
+    if (userInfo) {
+        _userInfo = userInfo;
+        NSLog(@"ShutoApi: User info set successfully: %@", userInfo);
+    } else {
+        NSLog(@"ShutoApi: Invalid user info provided");
+    }
+}
+
 // 触发导航到指定路由的事件
 - (void)navigateToRoute:(NSString*)route parameters:(NSDictionary*)parameters {
     if (!_eventCallbackId) {