feat(withdraw): OPPO 厂商通道直连推送 — 提现审核通过通知

- integrations/oppo_push.py: OPPO PUSH 服务端直连(sha256 鉴权 + auth_token 24h 缓存 + unicast 单推)
- device_liveness 加 oppo_register_id 列 + 迁移; register/heartbeat 透传 + list 查询
- services/push_notify: 审核通过 fire-and-forget 推送(best-effort, 不阻塞审核响应)
- admin withdraw approve(单笔+批量)挂钩(status=failed 已退款不推)
- 单测 10 passed; 真调 OPPO 生产 auth/unicast 验证签名与请求构造

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/v1/device.py

@@ -40,6 +40,7 @@ def register_device(
         user_id=user.id,
         device_id=req.device_id,
         registration_id=req.registration_id,
+        oppo_register_id=req.oppo_register_id,
         platform=req.platform,
         app_version=req.app_version,
     )
@@ -64,6 +65,7 @@ def report_heartbeat(
         device_id=req.device_id,
         accessibility_enabled=req.accessibility_enabled,
         registration_id=req.registration_id,
+        oppo_register_id=req.oppo_register_id,
     )
     return OkResponse()