feat(admin): 运营后台跟进——review 加固 + 反馈改版 + 列表页码分页 (#51)

本 PR 汇合三块运营后台改动(原 #50 仅含其中「加固」一块,已并入本 PR 并关闭)。

## 1. review 加固 (436b2a3)
- 超管防自锁:降级/禁用最后一个 active super_admin 前校验,杜绝零超管死局
- 时间筛选统一 tz-aware(列为 timestamptz),比较绝对时刻、不依赖 DB 会话时区
- 上报审核 / 调余额(set·扣减)加行锁,防并发/连点重复发钱
- ad_audit 复算排序补 id 次级键;health-check 限 finance;调账/拒绝 reason 去空白校验

## 2. 反馈改版 (5a18dbb)
- contact 可选、截图≤6;admin 反馈列表筛选/排序;admin·wallet 接口调整 + docs

## 3. 列表页码分页 (1a7a624)
- CursorPage 加 total;新增 offset_paginate(count 与分页同源)
- 上报/审计日志从 id 游标改 offset 分页(支持跳页)
- 用户 / 提现 / 上报 / 审计日志 四页接入页码分页

测试:admin 套件 47 passed。前端配套改动见 shaguabijia-admin-web。

---------

Co-authored-by: OuYingJun1024 <1034284404@qq.com>
Reviewed-on: #51
Co-authored-by: ouzhou <ouzhou@wonderable.ai>
Co-committed-by: ouzhou <ouzhou@wonderable.ai>

app/admin/routers/users.py

@@ -45,7 +45,7 @@ def list_users(
     limit: Annotated[int, Query(ge=1, le=100)] = 20,
     cursor: Annotated[int | None, Query()] = None,
 ) -> CursorPage[AdminUserListItem]:
-    items, next_cursor = queries.list_users(
+    items, next_cursor, total = queries.list_users(
         db, phone=phone, register_channel=register_channel, status=status,
         nickname=nickname, created_from=created_from, created_to=created_to,
         last_login_from=last_login_from, last_login_to=last_login_to,
@@ -54,6 +54,7 @@ def list_users(
     return CursorPage(
         items=[AdminUserListItem.model_validate(u) for u in items],
         next_cursor=next_cursor,
+        total=total,
     )
 
 
@@ -126,7 +127,8 @@ def grant_user_coins(
     if body.mode == "set":
         if body.amount < 0:
             raise HTTPException(status_code=400, detail="目标金币值不能为负")
-        before = wallet_repo.get_or_create_account(db, user_id, commit=False).coin_balance
+        # lock=True:锁账户行,防连点/并发各读同一 before 算同一 delta 双写,余额错位
+        before = wallet_repo.get_or_create_account(db, user_id, commit=False, lock=True).coin_balance
         delta = body.amount - before
         if delta == 0:
             raise HTTPException(status_code=400, detail=f"当前金币已为 {body.amount},无需调整")
@@ -134,9 +136,9 @@ def grant_user_coins(
         if body.amount == 0:
             raise HTTPException(status_code=400, detail="amount 不能为 0")
         delta = body.amount
-        # 负数扣减时不允许扣成负余额(运营误操作保护)
+        # 负数扣减时不允许扣成负余额(运营误操作保护);lock=True 防并发扣穿
         if delta < 0:
-            acc_now = wallet_repo.get_or_create_account(db, user_id, commit=False)
+            acc_now = wallet_repo.get_or_create_account(db, user_id, commit=False, lock=True)
             if acc_now.coin_balance + delta < 0:
                 raise HTTPException(
                     status_code=400, detail=f"扣减后金币为负(当前余额 {acc_now.coin_balance})"
@@ -174,7 +176,10 @@ def grant_user_cash(
     if body.mode == "set":
         if body.amount_cents < 0:
             raise HTTPException(status_code=400, detail="目标现金值不能为负")
-        before = wallet_repo.get_or_create_account(db, user_id, commit=False).cash_balance_cents
+        # lock=True:锁账户行,防连点/并发各读同一 before 算同一 delta 双写,余额错位
+        before = wallet_repo.get_or_create_account(
+            db, user_id, commit=False, lock=True
+        ).cash_balance_cents
         delta = body.amount_cents - before
         if delta == 0:
             raise HTTPException(
@@ -184,9 +189,9 @@ def grant_user_cash(
         if body.amount_cents == 0:
             raise HTTPException(status_code=400, detail="amount_cents 不能为 0")
         delta = body.amount_cents
-        # 负数扣减时不允许扣成负余额(运营误操作保护)
+        # 负数扣减时不允许扣成负余额(运营误操作保护);lock=True 防并发扣穿
         if delta < 0:
-            acc_now = wallet_repo.get_or_create_account(db, user_id, commit=False)
+            acc_now = wallet_repo.get_or_create_account(db, user_id, commit=False, lock=True)
             if acc_now.cash_balance_cents + delta < 0:
                 raise HTTPException(
                     status_code=400, detail=f"扣减后现金为负(当前余额 {acc_now.cash_balance_cents} 分)"