feat(admin): 上报更低价人工审核（通过发1000金币/拒绝填理由） (#33)

运营后台审核用户上报的「某平台比我们算的最低价更便宜」+截图。

- routers/price_report.py：列表 + /summary、approve|reject（require operator）
- repositories：list_price_reports + price_report_summary（queries）、review_price_report（mutations）
- core/rewards.py：PRICE_REPORT_REWARD_COINS=1000（通过即发，grant_coins 由 router 同事务调）
- admin/main.py：注册 price_report_router

跨端配套：前端 admin-web feat/price-report-review；端上金币刷新 android feat/price-report-review。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: xianze <ze@192.168.0.128>
Reviewed-on: #33
Co-authored-by: zhangxianze <zhangxianze@wonderable.ai>
Co-committed-by: zhangxianze <zhangxianze@wonderable.ai>

app/admin/repositories/queries.py

@@ -14,6 +14,7 @@ from sqlalchemy.orm import Session
 from app.models.admin import AdminAuditLog
 from app.models.comparison import ComparisonRecord
 from app.models.feedback import Feedback
+from app.models.price_report import PriceReport
 from app.models.user import User
 from app.models.wallet import CashTransaction, CoinAccount, CoinTransaction, WithdrawOrder
 
@@ -395,3 +396,34 @@ def get_user_overview(db: Session, user_id: int) -> dict | None:
         ).scalar_one(),
         "feedback_total": _count(Feedback, Feedback.user_id == user_id),
     }
+
+
+def list_price_reports(
+    db: Session,
+    *,
+    status: str | None = None,
+    user_id: int | None = None,
+    limit: int = 20,
+    cursor: int | None = None,
+) -> tuple[list[PriceReport], int | None]:
+    """上报更低价列表(admin 全量,可按状态/用户筛)。游标同 feedback:id 倒序。"""
+    stmt = select(PriceReport)
+    if status:
+        stmt = stmt.where(PriceReport.status == status)
+    if user_id is not None:
+        stmt = stmt.where(PriceReport.user_id == user_id)
+    return cursor_paginate(db, stmt, PriceReport.id, limit=limit, cursor=cursor)
+
+
+def price_report_summary(db: Session) -> dict:
+    """上报审核台各状态计数(待审核/已通过/已拒绝/合计)。"""
+    rows = db.execute(
+        select(PriceReport.status, func.count(PriceReport.id)).group_by(PriceReport.status)
+    ).all()
+    by_status = {status: int(count) for status, count in rows}
+    return {
+        "pending": by_status.get("pending", 0),
+        "approved": by_status.get("approved", 0),
+        "rejected": by_status.get("rejected", 0),
+        "total": sum(by_status.values()),
+    }