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>

tests/test_onboarding.py

@@ -65,33 +65,3 @@ def test_onboarding_missing_device_id_treated_as_incomplete(client) -> None:
     phone = "13800138003"
     data = _login(client, phone, device_id=None)
     assert data["onboarding_completed"] is False
-
-
-def test_complete_clears_force_onboarding(client) -> None:
-    """运营「一键开启新手引导」(force_onboarding=True)后,用户走完引导即自动清除该标记,
-    /me 随之回到 false——否则下次启动会被无限拉回引导。"""
-    from app.db.session import SessionLocal
-    from app.models.user import User
-
-    phone = "13800138004"
-    dev = "android-id-force"
-    data = _login(client, phone, dev)
-    access = data["access_token"]
-    uid = data["user"]["id"]
-
-    # 模拟运营在后台一键开启(admin 接口本身另在 test_admin_write 覆盖)
-    db = SessionLocal()
-    try:
-        db.get(User, uid).force_onboarding = True
-        db.commit()
-    finally:
-        db.close()
-
-    def _me() -> dict:
-        return client.get(
-            "/api/v1/auth/me", headers={"Authorization": f"Bearer {access}"}
-        ).json()
-
-    assert _me()["force_onboarding"] is True
-    assert _mark_complete(client, access, dev).status_code == 200
-    assert _me()["force_onboarding"] is False