feat(coin): 金币数值体系二期——看广告按 eCPM 发奖 + ad_session_id 幂等 + 签到膨胀固定金币 (#28)

- rewards: 激励视频实发改按 calculate_ad_reward_coin(eCPM, 当日第N次) 公式;AD_REWARD_COIN/MAX_AD_REWARD_COIN 降为历史兼容口径;新增 SIGNIN_BOOST_COIN=2000

- 签到膨胀: Day1-13 看完激励视频额外发固定金币、Day14 不允许 (signin.py / signin-boost)

- ad_session_id 幂等: ad_ecpm/ad_reward/ad_feed_reward 记录加 ad_session_id 列 + 唯一索引(新迁移 coin_reward_phase2 / ad_feed_reward_session)

- ad.py + schemas + repositories: ecpm-report / feed-reward / reward-status / test-grant 改造;config_schema 增 signin_boost_coin;admin stats overview 补充

- 同步 docs/api + docs/database + docs/integrations/pangle 及 tests(test_ad_reward / test_welfare)

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

---------

Co-authored-by: OuYingJun1024 <1034284404@qq.com>
Reviewed-on: #28
Co-authored-by: ouzhou <ouzhou@wonderable.ai>
Co-committed-by: ouzhou <ouzhou@wonderable.ai>

docs/database/OVERVIEW.md

@@ -64,7 +64,7 @@
 | 金币兑现金 `POST /wallet/exchange` | `coin_account`(U) + `coin_transaction`(C `exchange_out` −) + `cash_transaction`(C `exchange_in` +) | 同事务 |
 | 发起提现 `POST /wallet/withdraw` | `withdraw_order`(C `reviewing`) + `coin_account`(U 扣现金) + `cash_transaction`(C `withdraw` −) | 同事务,**不打款** |
 | 查提现状态 / 用户取消 `GET /wallet/withdraw/status` | `withdraw_order`(U) + 失败→`cash_transaction`(C `withdraw_refund` +) | |
-| 穿山甲发奖 S2S 回调 `POST /ad/pangle-callback` | `ad_reward_record`(C)+ granted→`coin_account`(U)+`coin_transaction`(C `ad_reward`) | `trans_id` 幂等 |
+| 穿山甲发奖 S2S 回调 `POST /ad/pangle-callback` | `ad_reward_record`(C)+ granted→`coin_account`(U)+`coin_transaction`(C `reward_video`/`signin_boost`) | `trans_id` 幂等 |
 | 看广告时长上报 `POST /ad/watch-report` | `ad_watch_log`(C) | |
 | 广告 eCPM 上报 `POST /ad/ecpm-report` | `ad_ecpm_record`(C) | |
 | 信息流广告结算 `POST /ad/feed-reward` | `ad_feed_reward_record`(C)+ granted→`coin_account`(U)+`coin_transaction`(C `feed_ad_reward`) | `client_event_id` 幂等 |
@@ -105,7 +105,7 @@
   | `signin` | 当天日期串(= `signin_record.signin_date` 的 ISO `YYYY-MM-DD`) | + |
   | `signin_boost` | 当天日期串(= `signin_boost_record.signin_date` 的 ISO `YYYY-MM-DD`) | + |
   | `task_<key>` | `user_task.task_key` | + |
-  | `ad_reward` | `ad_reward_record.trans_id` | + |
+  | `reward_video` / `ad_reward`(历史) | `ad_reward_record.trans_id` | + |
   | `feed_ad_reward` | `ad_feed_reward_record.client_event_id` | + |
   | `exchange_out` | null(兑现金,无单据) | − |
   | `admin_grant` / `admin_deduct` | null(原因记在 `remark`=`admin:<reason>`) | + / − |
@@ -118,7 +118,7 @@
   | `exchange_in` | null | + |
 
 - **`comparison_record.store_name` ≈ `savings_record.shop_name`**:无 id 关联,按**店名字符串相等**给比价记录打「已下单」标记(瞬态,不写库)。两边店名同源 = 比价意图识别阶段的门店 query,语义=**店级**(同店比价多次会一并标已下单)。
-- **广告流互不关联**:`ad_reward_record` / `ad_watch_log` / `ad_ecpm_record` / `ad_feed_reward_record` 之间**无公共键**,各自只按 `(user_id, 日期串)` 聚合。别试图 join 它们逐条对应。
+- **广告流会话关联**:`ad_reward_record.ad_session_id` 可与 `ad_ecpm_record.ad_session_id` 对齐;`ad_watch_log` 仍是旧版兼容统计,不逐条参与发奖。
 - **里程碑解锁进度不存库**:`comparison_milestone_claim` 只记「哪几档已领」;进度 = `comparison_record` 里 `status='success'` 的 `count`。
 
 ### ER 关系(文字版)