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>

alembic/versions/d4e68464761d_merge_ad_revenue_report_cols_and_store_.py

@@ -0,0 +1,26 @@
+"""merge ad_revenue_report_cols and store_mapping_tb_dl_invalid heads
+
+Revision ID: d4e68464761d
+Revises: ad_revenue_report_cols, store_mapping_tb_dl_invalid
+Create Date: 2026-06-15 21:55:58.115692
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd4e68464761d'
+down_revision: Union[str, Sequence[str], None] = ('ad_revenue_report_cols', 'store_mapping_tb_dl_invalid')
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass