docs(admin): 补充管理后台 API 与数据库文档 (#12)

新增 admin 模块接口文档(auth login/me、admins CRUD、audit-logs、feedback 处理、stats 概览、user coins/detail/status、wallet 流水、withdraw 对账/刷新/列表) + admin_user/admin_audit_log 两张表文档，更新 api/database README 索引。

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

---------

Co-authored-by: OuYingJun1024 <1034284404@qq.com>
Reviewed-on: #12
Co-authored-by: ouzhou <ouzhou@wonderable.ai>
Co-committed-by: ouzhou <ouzhou@wonderable.ai>

app/api/v1/savings.py

@@ -42,6 +42,7 @@ def battle(user: CurrentUser, db: DbSession) -> SavingsBattleOut:
         week_saved_cents=b.week_saved_cents,
         beat_percent=b.beat_percent,
         streak_days=b.streak_days,
+        compare_count=b.compare_count,
     )
 
 

app/core/rewards.py

@@ -34,8 +34,9 @@ COIN_PER_YUAN: int = 10000
 CENTS_PER_YUAN: int = 100
 # 1 分对应多少金币 = 100。兑换金币数必须是它的整数倍,否则会出现不足 1 分的零头。
 COIN_PER_CENT: int = COIN_PER_YUAN // CENTS_PER_YUAN
-# 单次兑换最少 1 元(避免大量 1 分级碎兑)
-MIN_EXCHANGE_COIN: int = COIN_PER_YUAN
+# 单次兑换最少 1 分(=COIN_PER_CENT;产品定:可兑 1 分起,与 step 同粒度)。早先为 1 元(=COIN_PER_YUAN),
+# 用户 2026-06 改为 1 分:让"换现金"小额即可用(也方便联调验证资产卡飞金币动画)。
+MIN_EXCHANGE_COIN: int = COIN_PER_CENT
 
 
 def coins_to_cents(coin_amount: int) -> int:
@@ -54,7 +55,7 @@ TASK_ENABLE_NOTIFICATION = "enable_notification"
 
 # task_key -> 奖励金币
 # 打开消息提醒: 1000 金币(=¥0.1, 客户端原型展示口径; 量级与签到/里程碑相称)。
-# 注意: 已不再 = 兑换下限(MIN_EXCHANGE_COIN=10000), test_exchange_flow 改走 grant_coins 直接供款。
+# 注意: 不再 = 兑换下限(下限已降到 MIN_EXCHANGE_COIN=COIN_PER_CENT=100), test_exchange_flow 改走 grant_coins 直接供款。
 TASK_REWARDS: dict[str, int] = {
     TASK_ENABLE_NOTIFICATION: 1000,
 }

app/models/comparison.py

@@ -86,7 +86,7 @@ class ComparisonRecord(Base):
     # ===== 明细(JSON,越详细越好)=====
     # 下单菜品 [{name, qty, specs?}]
     items: Mapped[list] = mapped_column(_JSON, nullable=False, default=list)
-    # 逐平台对比 [{platform_id, platform_name, package, price, is_source, rank, coupon_saved}](price/coupon_saved 单位:元,原样存)
+    # 逐平台对比 [{platform_id, platform_name, package, price, is_source, rank, coupon_saved, coupon_name}](price/coupon_saved 单位:元,原样存;coupon_name=优惠来源名)
     comparison_results: Mapped[list] = mapped_column(_JSON, nullable=False, default=list)
     # 目标平台未找到、跳过的菜名
     skipped_dish_names: Mapped[list] = mapped_column(_JSON, nullable=False, default=list)

app/repositories/savings.py

@@ -52,6 +52,7 @@ class SavingsBattle:
     week_saved_cents: int  # 本周(周一起)已省
     beat_percent: int  # 超过百分之多少用户
     streak_days: int  # 连续省钱天数
+    compare_count: int  # 累计完成比价次数(= 有效记录数:真实用 compare 记录、否则 demo 兜底)
 
 
 def _local_date(dt: datetime):
@@ -163,7 +164,10 @@ def get_battle(db: Session, user_id: int) -> SavingsBattle:
     beat_percent = _compute_beat_percent(db, user_id)
 
     return SavingsBattle(
-        week_saved_cents=week_saved, beat_percent=beat_percent, streak_days=streak
+        week_saved_cents=week_saved,
+        beat_percent=beat_percent,
+        streak_days=streak,
+        compare_count=len(records),
     )
 
 

app/schemas/compare_record.py

@@ -37,6 +37,9 @@ class ComparisonResultIn(BaseModel):
     # 必须显式声明: 落库走 model_dump(), pydantic 默认丢未知字段, 不声明这行会被悄悄吞掉。
     # 各平台抠到红包即带值(2026-06 起源平台 Phase1 意图识别也抠, 当前仅淘宝源)。见 pricebot 侧 比价红包额留痕-实现方案.md。
     coupon_saved: float | None = None
+    # 优惠**来源名**(展示用, best-effort): 美团"外卖大额神券"/京东"百亿补贴"/淘宝"平台红包"。
+    # None=没抠到 → 前端走通用"红包"。同样必须显式声明否则上报边界被 pydantic 静默丢弃(pricebot#38 引入)。
+    coupon_name: str | None = None
 
 
 class ComparisonRecordIn(BaseModel):

app/schemas/welfare.py

@@ -199,6 +199,7 @@ class SavingsBattleOut(BaseModel):
     week_saved_cents: int = Field(..., description="本周已省(分)")
     beat_percent: int = Field(..., description="超过百分之多少用户")
     streak_days: int = Field(..., description="连续省钱天数")
+    compare_count: int = Field(..., description="累计完成比价次数(= 比价上报记录数)")
 
 
 class SavingsRecordOut(BaseModel):