feat(onboarding): force_onboarding 改设备维度 + admin 设备管理 + status 查询

废弃 force_onboarding(运营按用户强制引导,客户端不认——被 onboarding_completed 压过),
改用 onboarding_completion(设备+账号 维度),admin 直接增删该表记录控制重走。

- 删 force_onboarding: User 列 + auth/admin schema + admin 接口 + mutations + repo
  clear + /onboarding/complete 调用 + 3 测试;新增 alembic 迁移删列
- admin 设备管理: 列设备(按 device 聚合) / 重置单设备 / 全部重置(清 onboarding_completion)
- 新增 GET /api/v1/user/onboarding/status: 客户端已登录启动查"本设备是否要重走引导"

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/admin/main.py

@@ -21,6 +21,7 @@ from app.admin.routers.config import router as config_router
 from app.admin.routers.dashboard import router as dashboard_router
 from app.admin.routers.ops_stat_config import router as ops_stat_config_router
 from app.admin.routers.feedback import router as feedback_router
+from app.admin.routers.onboarding import router as onboarding_router
 from app.admin.routers.ops_marquee_seed import router as ops_marquee_seed_router
 from app.admin.routers.price_report import router as price_report_router
 from app.admin.routers.users import router as users_router
@@ -80,6 +81,7 @@ admin_app.include_router(dashboard_router)
 admin_app.include_router(ops_stat_config_router)
 admin_app.include_router(ops_marquee_seed_router)
 admin_app.include_router(users_router)
+admin_app.include_router(onboarding_router)
 admin_app.include_router(wallet_router)
 admin_app.include_router(withdraw_router)
 admin_app.include_router(price_report_router)