消息通知中心 3 接口(mock 阶段) + 五厂商推送(补华为/通用发送/测试三件套)

- GET /api/v1/notifications(分页,时间倒序不分组)/unread-count /read(ids|all),
  对外 camelCase(PRD 前端契约);数据为内存 mock(13 类型全覆盖,重启复位),
  接真实数据只换 repositories/notification_mock.py
- vendor_push 补华为 Push Kit(OAuth+messages:send),抽通用 send_notification
  (任意文案+extras+mock 模式),send_accessibility_disabled 改薄封装行为不变
- 新增 /api/v1/push/{vendors,templates,test}:凭据状态/13 类 PRD 文案模板/测试发送
  (默认 mock,mock=false 真发,可联动插站内 mock 消息闭环验证已读)
- .env.example 补 HUAWEI_* 键;docs/api 新增 notifications.md + push-vendor-test.md
- alembic merge 1a924c274fce 收拢 direct_vendor_push_fields/feedback_type_reply
  双 head,恢复 upgrade head 可用
- tests: test_notifications + test_push_center 共 35 例

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/main.py

@@ -31,8 +31,10 @@ from app.api.v1.device import router as device_router
 from app.api.v1.feedback import router as feedback_router
 from app.api.v1.invite import router as invite_router
 from app.api.v1.meituan import router as meituan_router
+from app.api.v1.notifications import router as notifications_router
 from app.api.v1.order import router as order_router
 from app.api.v1.platform import router as platform_router
+from app.api.v1.push import router as push_router
 from app.api.v1.report import router as report_router
 from app.api.v1.savings import router as savings_router
 from app.api.v1.signin import router as signin_router
@@ -126,6 +128,10 @@ app.include_router(savings_router)
 app.include_router(ad_router)
 app.include_router(order_router)
 app.include_router(report_router)
+# 消息通知中心(PRD;虚拟数据阶段:mock 数据在内存,见 repositories/notification_mock.py)
+app.include_router(notifications_router)
+# 厂商推送测试三件套(配置状态/模板预览/测试发送,支持 mock 与真发)
+app.include_router(push_router)
 # 内部(server→server)端点:pricebot 上报价格观测 / 店铺映射,靠共享密钥头校验,不对客户端开放。
 app.include_router(internal_price_router)
 app.include_router(internal_store_router)