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/main.py

@@ -21,6 +21,7 @@ from app.admin.routers.dashboard import router as dashboard_router
 from app.admin.routers.ops_stat_config import router as ops_stat_config_router
 from app.admin.routers.feedback import router as feedback_router
 from app.admin.routers.ops_marquee_seed import router as ops_marquee_seed_router
+from app.admin.routers.price_report import router as price_report_router
 from app.admin.routers.users import router as users_router
 from app.admin.routers.wallet import router as wallet_router
 from app.admin.routers.withdraw import router as withdraw_router
@@ -80,6 +81,7 @@ admin_app.include_router(ops_marquee_seed_router)
 admin_app.include_router(users_router)
 admin_app.include_router(wallet_router)
 admin_app.include_router(withdraw_router)
+admin_app.include_router(price_report_router)
 admin_app.include_router(feedback_router)
 admin_app.include_router(admins_router)
 admin_app.include_router(audit_router)