feat: 实现企业设备授权功能并归档 OpenSpec 变更

- 新增企业设备授权模块（Model、DTO、Service、Handler、Store）
- 实现设备授权的创建、查询、更新、删除等完整业务逻辑
- 添加企业卡授权与设备授权的关联关系
- 新增 2 个数据库迁移脚本
- 同步 OpenSpec delta specs 到 main specs
- 归档 add-enterprise-device-authorization 变更
- 更新 API 文档和路由配置
- 新增完整的集成测试和单元测试覆盖

.claude/commands/opsx/continue.md

@@ -96,7 +96,7 @@ Common artifact patterns:
 **spec-driven schema** (proposal → specs → design → tasks):
 - **proposal.md**: Ask user about the change if not clear. Fill in Why, What Changes, Capabilities, Impact.
   - The Capabilities section is critical - each capability listed will need a spec file.
-- **specs/*.md**: Create one spec per capability listed in the proposal.
+- **specs/<capability>/spec.md**: Create one spec per capability listed in the proposal's Capabilities section (use the capability name, not the change name).
 - **design.md**: Document technical decisions, architecture, and implementation approach.
 - **tasks.md**: Break down implementation into checkboxed tasks.