feat(ad): 记录不发金币的原因(closed_early / too_short)

让广告收益报表能呈现「有展示、没发金币」的原因:
- grant_feed_reward 改整场结算:aborted→closed_early、整场总时长<10s→too_short(均 coin=0)
- 新增 record_reward_noshow + POST /api/v1/ad/reward-noshow(激励视频提前关留痕;
  同 ad_session_id 已 granted 则跳过,防与 S2S 发奖重复)
- feed-reward 加 aborted 入参
- 文档:feed-reward / 两张表 status 取值、新增 ad-reward-noshow、README 索引
- alembic: 合并 ad_revenue_report_cols 与 store_mapping_tb_dl_invalid 双 head(空迁移)

报表复算无需改(非 granted 状态走 else 分支 expected=0 自动归类)。

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

docs/api/README.md

@@ -63,6 +63,7 @@
 | 34 | `POST /api/v1/ad/test-grant` | Bearer | [详情](./ad-test-grant.md) |
 | 35 | `POST /api/v1/ad/ecpm-report` | Bearer | [详情](./ad-ecpm-report.md) |
 | 35a | `POST /api/v1/ad/feed-reward` | Bearer | [详情](./ad-feed-reward.md) |
+| 35b | `POST /api/v1/ad/reward-noshow` | Bearer | [详情](./ad-reward-noshow.md)(激励视频提前关闭/未发奖留痕,只记原因不发币) |
 | **用户资料**（前缀 `/api/v1/user`） |||
 | 35 | `PATCH /api/v1/user/profile` | Bearer | [详情](./user-profile.md) |
 | 36 | `POST /api/v1/user/avatar` | Bearer | [详情](./user-avatar.md) |