perf(usage): heatmap 改为数据库端按天聚合查询

将 admin 和 user heatmap 从逐条加载 usage audit 记录后在应用层聚合,
改为通过 SQL GROUP BY DATE 在数据库端直接按天汇总, 大幅减少数据传输量。

新增 UsageDailyHeatmapQuery / StoredUsageDailySummary 类型,
在 trait、SQL、内存实现中均补齐 summarize_usage_daily_heatmap 方法。

同时优化 docker-compose: postgres 增加空闲事务超时与 keepalive 参数,
gateway 增加健康检查配置。

apps/aether-gateway/src/data/state/runtime.rs

@@ -21,7 +21,9 @@ use super::{
     VideoTaskModelCount, VideoTaskQueryFilter, VideoTaskStatusCount, WalletLookupKey,
     WalletMutationOutcome,
 };
-use aether_data_contracts::repository::usage::UsageAuditListQuery;
+use aether_data_contracts::repository::usage::{
+    StoredUsageDailySummary, UsageAuditListQuery, UsageDailyHeatmapQuery,
+};
 use aether_video_tasks_core::read_data_backed_video_task_response;
 
 impl GatewayDataState {
@@ -664,6 +666,16 @@ impl GatewayDataState {
         }
     }
 
+    pub(crate) async fn summarize_usage_daily_heatmap(
+        &self,
+        query: &UsageDailyHeatmapQuery,
+    ) -> Result<Vec<StoredUsageDailySummary>, DataLayerError> {
+        match &self.usage_reader {
+            Some(repository) => repository.summarize_usage_daily_heatmap(query).await,
+            None => Ok(Vec::new()),
+        }
+    }
+
     pub(crate) async fn list_recent_usage_audits(
         &self,
         user_id: Option<&str>,