feat(ad-audit): 新增看广告金币审计页 (#4)

- /ad-audit 复算对账页:公式快照 + reward_video/feed 发奖明细 + 实发与复算一致性校验
- 侧栏新增「金币审计」导航
- types 增加 AdCoinAuditRow / AdCoinFormula / AdCoinAudit

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: OuYingJun1024 <1034284404@qq.com>
Reviewed-on: #4
Co-authored-by: ouzhou <ouzhou@wonderable.ai>
Co-committed-by: ouzhou <ouzhou@wonderable.ai>

src/lib/types.ts

@@ -180,6 +180,41 @@ export interface AuditLog {
   created_at: string;
 }
 
+export interface AdCoinAuditRow {
+  scene: string; // reward_video / feed
+  record_id: number;
+  user_id: number;
+  created_at: string;
+  status: string; // granted / capped / ecpm_missing
+  ecpm: string | null;
+  ecpm_factor: number | null;
+  units: number;
+  lt_index_start: number | null;
+  lt_index_end: number | null;
+  lt_factor_start: number | null;
+  lt_factor_end: number | null;
+  expected_coin: number;
+  actual_coin: number;
+  matched: boolean;
+}
+
+export interface AdCoinFormula {
+  description: string;
+  coin_per_yuan: number;
+  ecpm_unit: string;
+  feed_unit_seconds: number;
+  ecpm_factor_tiers: [number, number, number | null][];
+  lt_factor_tiers: [number, number, number | null][];
+}
+
+export interface AdCoinAudit {
+  date: string;
+  formula: AdCoinFormula;
+  total: number;
+  mismatch_count: number;
+  items: AdCoinAuditRow[];
+}
+
 export interface DashboardOverview {
   users: {
     total: number;