feat(invite): 被邀请人列表接口 + 指纹归因(任务3) (#31)

- GET /invitees: 分页 + 名字降级兜底(昵称→微信昵称→脱敏手机号)
- 指纹归因: 落地页采集 + (IP,设备型号)反查撞库 + 时间窗口闸
- test_invite: +5 个列表测试(脱敏/倒序/昵称优先/分页/空), 修指纹测试跨用例串味

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

Reviewed-on: #31
Co-authored-by: xiebing <xiebing@wonderable.ai>
Co-committed-by: xiebing <xiebing@wonderable.ai>

app/models/__init__.py

@@ -13,6 +13,7 @@ from app.models.coupon_state import (  # noqa: F401
 )
 from app.models.feedback import Feedback  # noqa: F401
 from app.models.invite import InviteRelation  # noqa: F401
+from app.models.invite_fingerprint import InviteFingerprint  # noqa: F401
 from app.models.meituan_coupon import MeituanCoupon  # noqa: F401
 from app.models.ops_marquee_seed import OpsMarqueeSeed  # noqa: F401
 from app.models.ops_stat_config import OpsStatConfig  # noqa: F401