feat(price-reports): 运营后台「上报审核」页

用户上报"某平台比我们算的最低价更便宜"+截图,运营人工审核:
- price-reports/page.tsx: 列表+截图预览+通过(发1000金币)/拒绝(填理由),仿 withdraws
- layout.tsx: 侧边栏菜单加「上报审核」(FlagOutlined)
- lib/types.ts: PriceReport / PriceReportSummary DTO
- .gitignore: 加 CLAUDE.md(本地维护不入库,同 android/app-server 约定)

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

src/lib/types.ts

@@ -198,3 +198,30 @@ export interface DashboardOverview {
   feedback: { new: number };
   cps: { available: boolean; note: string };
 }
+
+export interface PriceReport {
+  id: number;
+  user_id: number;
+  comparison_record_id: number | null;
+  store_name: string | null;
+  dish_summary: string | null;
+  original_platform_id: string | null;
+  original_platform_name: string | null;
+  original_price_cents: number | null;
+  reported_platform_id: string;
+  reported_platform_name: string;
+  reported_price_cents: number;
+  images: string[];
+  status: string; // pending / approved / rejected
+  reject_reason: string | null;
+  reward_coins: number | null;
+  reviewed_at: string | null;
+  created_at: string;
+}
+
+export interface PriceReportSummary {
+  pending: number;
+  approved: number;
+  rejected: number;
+  total: number;
+}