feat(admin-withdraw): 提现详情金币记录分页 + 风险标签拆分 (#64)

- user_coin_records 增返 total(三源 granted 计数和),支持前端页码分页
- 风险标签「历史异常提现」拆成「提现拒绝N笔」「提现失败N笔」(拒绝=人工驳回退款,失败=打款失败退款)

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

---------

Co-authored-by: zzhyyyyy <2685922758@qq.com>
Reviewed-on: #64
Co-authored-by: zhuzihao <zhuzihao@wonderable.ai>
Co-committed-by: zhuzihao <zhuzihao@wonderable.ai>

app/admin/routers/users.py

@@ -100,11 +100,11 @@ def get_user_coin_records(
     limit: Annotated[int, Query(ge=1, le=100)] = 20,
     cursor: Annotated[int | None, Query()] = None,
 ) -> CursorPage[UserCoinRecord]:
-    items, next_cursor = queries.user_coin_records(
+    items, next_cursor, total = queries.user_coin_records(
         db, user_id, date_from=date_from, date_to=date_to, limit=limit, cursor=cursor,
     )
     return CursorPage(
-        items=[UserCoinRecord(**r) for r in items], next_cursor=next_cursor,
+        items=[UserCoinRecord(**r) for r in items], next_cursor=next_cursor, total=total,
     )