fix: 停用登录设备绑定(注释 machine 写入/重绑与 check_login 不一致拒绝)便于多设备/联调；Vue 首页背景图改 /bg.jpg 并补 public 资源、首页/登录布局居中修复

backend-java/src/main/java/com/nanri/aiimage/modules/auth/service/AuthService.java

@@ -48,6 +48,10 @@ public class AuthService {
         }
 
         boolean isAdmin = user.getIsAdmin() != null && user.getIsAdmin() == 1;
+        // ---- 设备绑定逻辑临时停用（便于多设备 / 浏览器联调）----
+        // 原逻辑：首次登录写入 machine；设备指纹变化时把 machine 重绑到当前设备。
+        // 注释期间登录不写、不校验 machine，任何设备均可登录，仅保留日志便于排查。
+        /*
         String stored = user.getMachine() == null ? "" : user.getMachine().trim();
         if (stored.isEmpty()) {
             loginUserMapper.update(null, new LambdaUpdateWrapper<LoginUserEntity>()
@@ -67,6 +71,9 @@ public class AuthService {
             log.info("[auth] device match userId={} isAdmin={} device={}",
                     user.getId(), isAdmin, deviceId);
         }
+        */
+        log.info("[auth] login (device-bind disabled) userId={} isAdmin={} device={}",
+                user.getId(), isAdmin, deviceId);
 
         return buildResult(user, deviceId, isAdmin);
     }
@@ -97,6 +104,8 @@ public class AuthService {
             Object claimDevice = claims.get("deviceId");
             device = claimDevice == null ? "" : claimDevice.toString().trim();
         }
+        // ---- 设备绑定逻辑临时停用：设备不一致不再拒绝登录态，仅保留告警日志 ----
+        /*
         if (!stored.isEmpty() && !device.isEmpty() && !stored.equals(device)) {
             if (isAdmin) {
                 log.warn("[auth] check_login device mismatch but admin bypass userId={} stored={} current={}",
@@ -107,6 +116,11 @@ public class AuthService {
                 throw new BusinessException(401, "当前设备与首次登录设备不一致");
             }
         }
+        */
+        if (!stored.isEmpty() && !device.isEmpty() && !stored.equals(device)) {
+            log.warn("[auth] check_login device mismatch (bypass) userId={} stored={} current={}",
+                    user.getId(), stored, device);
+        }
         return buildResult(user, stored.isEmpty() ? device : stored, isAdmin);
     }