feat(密钥): 用户 API 密钥服务端化——V115 按账号绑定存储 + 后台密钥管理页 + 桌面端全站拦截与配置引导

- 新增 usersecret 模块：外观专利/货源查询密钥从本地 localStorage 迁移至 biz_user_api_secret（AES 加密、按 uid 绑定）
- 后台「密钥管理」页：脱敏展示、立即检测、清空；每日 04:30 分布式锁定时巡检
- 桌面端：密钥设置面板走服务端、未配齐引导 /setup-secrets、代理余量展示
- 删除专利汇令牌全链路与密钥保留时长选择器

backend-java/src/main/java/com/nanri/aiimage/config/PropertiesConfig.java

@@ -4,6 +4,6 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.context.annotation.Configuration;
 
 @Configuration
-@EnableConfigurationProperties({OssProperties.class, TransientStorageProperties.class, StorageProperties.class, BrandProgressProperties.class, DeleteBrandProgressProperties.class, BrandCheckProperties.class, ZiniaoProperties.class, ModuleCleanupProperties.class, TaskPressureProperties.class, TaskImageCacheCleanupProperties.class, AppearancePatentProperties.class, SimilarAsinProperties.class, ImageVideoProperties.class, InstanceRoutingProperties.class, CapacityPlanProperties.class})
+@EnableConfigurationProperties({OssProperties.class, TransientStorageProperties.class, StorageProperties.class, BrandProgressProperties.class, DeleteBrandProgressProperties.class, BrandCheckProperties.class, ZiniaoProperties.class, ModuleCleanupProperties.class, TaskPressureProperties.class, TaskImageCacheCleanupProperties.class, AppearancePatentProperties.class, SimilarAsinProperties.class, ImageVideoProperties.class, InstanceRoutingProperties.class, CapacityPlanProperties.class, UserSecretProperties.class})
 public class PropertiesConfig {
 }