fix: 添加deviceId作为登录备选方案

- 后端：微信API失败时使用deviceId作为openId
- 前端：生成并缓存唯一deviceId
- 确保同一设备登录时用户身份一致

src/main/java/xuan/controller/UserController.java

@@ -76,9 +76,17 @@ public class UserController {
             }
             
             if (openId == null || openId.isEmpty()) {
-                result.put("success", false);
-                result.put("error", "获取用户身份失败，请重试");
-                return result;
+                // 开发环境：如果appId或appSecret未配置，使用deviceId作为临时方案
+                String deviceId = params.get("deviceId") != null ? params.get("deviceId").toString() : null;
+                if (deviceId != null && !deviceId.isEmpty()) {
+                    openId = "device_" + deviceId;
+                    System.out.println("使用设备ID作为openId: " + openId);
+                } else {
+                    System.err.println("获取openId失败，请检查微信配置或提供deviceId");
+                    result.put("success", false);
+                    result.put("error", "获取用户身份失败，请重试");
+                    return result;
+                }
             }
             
             UserInfo user = userInfoService.loginOrRegister(openId, username, avatarUrl);

xuan-deduct-uniapp/src/components/auth-modal/auth-modal.vue

@@ -245,7 +245,8 @@ export default {
         const res = await api.userApi.loginOrRegister({
           code: loginRes.code,
           nickname: this.nickname,
-          avatarUrl: avatarUrlForServer
+          avatarUrl: avatarUrlForServer,
+          deviceId: this.getDeviceId()
         })
         
         if (res.success) {
@@ -288,6 +289,15 @@ export default {
       }
     },
     
+    getDeviceId() {
+      let deviceId = uni.getStorageSync('deviceId')
+      if (!deviceId) {
+        deviceId = 'dev_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9)
+        uni.setStorageSync('deviceId', deviceId)
+      }
+      return deviceId
+    },
+    
     handleCancel() {
       this.showAnimation = false
       setTimeout(() => {