feat(gateway/data): 新增 usage 关键词搜索、缓存命中摘要、结算成本摘要及 dashboard 聚合查询能力

- 新增 UsageAuditKeywordSearchQuery，支持多关键词、用户名、API Key 交叉过滤
- 新增 UsageCacheHitSummaryQuery/StoredUsageCacheHitSummary，统计请求缓存命中率
- 新增 UsageSettledCostSummaryQuery/StoredUsageSettledCostSummary，汇总结算成本
- 新增 UsageDashboardSummaryQuery、UsageBreakdownSummaryQuery 等 dashboard 聚合类型
- SQL 层实现对应查询方法，含 list_by_ids、list_usage_audits_by_keyword_search、count_usage_audits_by_keyword_search
- 将上述能力通过 GatewayDataState / AdminAppState 暴露给 handler 层
- user_me_usage 及 dashboard_filters 切换为新查询接口，移除旧的内存过滤逻辑
- 同步更新 memory 层及测试

crates/aether-data/src/repository/usage/mod.rs

@@ -5,11 +5,23 @@ mod sql;
 pub(crate) use aether_data_contracts::repository::usage::{
     StoredProviderApiKeyUsageSummary, StoredProviderUsageSummary, StoredProviderUsageWindow,
     StoredRequestUsageAudit, StoredUsageAuditAggregation, StoredUsageAuditSummary,
-    StoredUsageDailySummary, StoredUsageLeaderboardSummary, StoredUsageTimeSeriesBucket,
-    UpsertUsageRecord, UsageAuditAggregationGroupBy, UsageAuditAggregationQuery,
-    UsageAuditListQuery, UsageAuditSummaryQuery, UsageDailyHeatmapQuery, UsageLeaderboardGroupBy,
-    UsageLeaderboardQuery, UsageReadRepository, UsageRepository, UsageTimeSeriesGranularity,
-    UsageTimeSeriesQuery, UsageWriteRepository,
+    StoredUsageBreakdownSummaryRow, StoredUsageCacheAffinityHitSummary,
+    StoredUsageCacheAffinityIntervalRow, StoredUsageCacheHitSummary, StoredUsageCostSavingsSummary,
+    StoredUsageDailySummary, StoredUsageDashboardDailyBreakdownRow,
+    StoredUsageDashboardProviderCount, StoredUsageDashboardSummary,
+    StoredUsageErrorDistributionRow, StoredUsageLeaderboardSummary,
+    StoredUsagePerformancePercentilesRow, StoredUsageSettledCostSummary,
+    StoredUsageTimeSeriesBucket, UpsertUsageRecord, UsageAuditAggregationGroupBy,
+    UsageAuditAggregationQuery, UsageAuditKeywordSearchQuery, UsageAuditListQuery,
+    UsageAuditSummaryQuery, UsageBreakdownGroupBy, UsageBreakdownSummaryQuery,
+    UsageCacheAffinityHitSummaryQuery, UsageCacheAffinityIntervalGroupBy,
+    UsageCacheAffinityIntervalQuery, UsageCacheHitSummaryQuery, UsageCostSavingsSummaryQuery,
+    UsageDailyHeatmapQuery, UsageDashboardDailyBreakdownQuery, UsageDashboardProviderCountsQuery,
+    UsageDashboardSummaryQuery, UsageErrorDistributionQuery, UsageLeaderboardGroupBy,
+    UsageLeaderboardQuery, UsageMonitoringErrorCountQuery, UsageMonitoringErrorListQuery,
+    UsagePerformancePercentilesQuery, UsageReadRepository, UsageRepository,
+    UsageSettledCostSummaryQuery, UsageTimeSeriesGranularity, UsageTimeSeriesQuery,
+    UsageWriteRepository,
 };
 pub use memory::InMemoryUsageReadRepository;
 pub use sql::SqlxUsageReadRepository;