perf(usage): 将 status 过滤下推到 SQL 查询层

为 UsageAuditListQuery 新增 statuses 字段，支持在数据库端按状态
筛选用量记录。admin usage summary 路由不再全量拉取后内存过滤，
改为直接查询 pending/streaming 状态的记录。

crates/aether-data-contracts/src/repository/usage/types.rs

@@ -480,6 +480,7 @@ pub struct UsageAuditListQuery {
     pub user_id: Option<String>,
     pub provider_name: Option<String>,
     pub model: Option<String>,
+    pub statuses: Option<Vec<String>>,
 }
 
 #[derive(Debug, Clone, PartialEq, Default, serde::Serialize, serde::Deserialize)]

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

@@ -1195,10 +1195,22 @@ impl SqlxUsageReadRepository {
         }
         if let Some(model) = query.model.as_deref() {
             builder.push(if has_where { " AND " } else { " WHERE " });
+            has_where = true;
             builder
                 .push("\"usage\".model = ")
                 .push_bind(model.to_string());
         }
+        if let Some(statuses) = query.statuses.as_deref() {
+            if !statuses.is_empty() {
+                builder.push(if has_where { " AND " } else { " WHERE " });
+                builder.push("\"usage\".status IN (");
+                let mut separated = builder.separated(", ");
+                for status in statuses {
+                    separated.push_bind(status.to_string());
+                }
+                separated.push_unseparated(")");
+            }
+        }
 
         builder.push(" ORDER BY \"usage\".created_at ASC, \"usage\".request_id ASC");
         let query = builder.build();