feat(stats): 新增聚合读路径与回填机制并重构 dashboard/usage 读取链路

- 新增 stats_user_summary 及 user_daily_provider/api_format/cost_savings 等聚合表
- 扩展 stats_daily/hourly 有效 token 与响应时间等字段，maintenance runtime 同步写入
- 新增 backfill 模块与 --apply-backfills 命令补齐历史聚合数据
- 重写 dashboard_filters、usage_heatmap、user_rollups 查询改走聚合表
- 同步更新 baseline_v2.sql 与 migration 集，README/dev.sh 补充回填用法

apps/aether-gateway/src/tests/control/admin/api_keys.rs

@@ -104,6 +104,7 @@ fn sample_standalone_export_record(
         Some(4_102_444_800),
         false,
         7,
+        0,
         1.25,
         true,
     )

apps/aether-gateway/src/tests/control/admin/monitoring.rs

@@ -414,6 +414,7 @@ fn sample_monitoring_export_api_key(
         None,
         false,
         0,
+        0,
         0.0,
         false,
     )

apps/aether-gateway/src/tests/control/admin/system.rs

@@ -635,6 +635,7 @@ async fn gateway_handles_admin_system_users_export_locally_with_trusted_admin_pr
                 Some(1_900_000_000),
                 false,
                 42,
+                420,
                 12.34,
                 false,
             )
@@ -661,6 +662,7 @@ async fn gateway_handles_admin_system_users_export_locally_with_trusted_admin_pr
                 None,
                 false,
                 7,
+                84,
                 3.21,
                 true,
             )
@@ -749,10 +751,15 @@ async fn gateway_handles_admin_system_users_export_locally_with_trusted_admin_pr
         payload["users"][0]["api_keys"][0]["is_standalone"],
         json!(false)
     );
+    assert_eq!(
+        payload["users"][0]["api_keys"][0]["total_tokens"],
+        json!(420)
+    );
     assert_eq!(
         payload["standalone_keys"][0]["key"],
         json!("ak-standalone-live-1")
     );
+    assert_eq!(payload["standalone_keys"][0]["total_tokens"], json!(84));
     assert_eq!(
         payload["standalone_keys"][0]["wallet"]["unlimited"],
         json!(true)

apps/aether-gateway/src/tests/control/admin/system_import.rs

@@ -607,6 +607,7 @@ async fn gateway_imports_admin_system_users_locally_and_persists_data() {
                     "expires_at": "2099-01-01T00:00:00Z",
                     "auto_delete_on_expiry": false,
                     "total_requests": 12,
+                    "total_tokens": 3456,
                     "total_cost_usd": 1.25
                 }]
             }],
@@ -622,6 +623,7 @@ async fn gateway_imports_admin_system_users_locally_and_persists_data() {
                 "expires_at": "2099-02-01T00:00:00Z",
                 "auto_delete_on_expiry": false,
                 "total_requests": 3,
+                "total_tokens": 789,
                 "total_cost_usd": 0.75,
                 "wallet": {
                     "balance": 30.0,
@@ -704,6 +706,7 @@ async fn gateway_imports_admin_system_users_locally_and_persists_data() {
         .expect("user api keys should load");
     assert_eq!(user_api_keys.len(), 1);
     assert_eq!(user_api_keys[0].name.as_deref(), Some("Alice CLI"));
+    assert_eq!(user_api_keys[0].total_tokens, 3456);
     assert_eq!(
         user_api_keys[0].allowed_api_formats,
         Some(vec!["openai:chat".to_string()])
@@ -729,6 +732,7 @@ async fn gateway_imports_admin_system_users_locally_and_persists_data() {
         standalone_keys[0].name.as_deref(),
         Some("Imported Standalone")
     );
+    assert_eq!(standalone_keys[0].total_tokens, 789);
     assert_eq!(
         decrypt_python_fernet_ciphertext(
             DEVELOPMENT_ENCRYPTION_KEY,

apps/aether-gateway/src/tests/control/admin/users.rs

@@ -674,6 +674,7 @@ async fn gateway_handles_admin_user_api_key_routes_locally_with_trusted_admin_pr
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )
@@ -835,6 +836,7 @@ async fn gateway_returns_conflict_for_admin_create_user_api_key_when_writer_unav
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )
@@ -963,6 +965,7 @@ async fn gateway_returns_conflict_for_admin_lock_user_api_key_when_writer_unavai
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )
@@ -1088,6 +1091,7 @@ async fn gateway_returns_conflict_for_admin_update_user_api_key_when_writer_unav
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )
@@ -1162,6 +1166,7 @@ async fn gateway_returns_conflict_for_admin_delete_user_api_key_when_writer_unav
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )
@@ -1238,6 +1243,7 @@ async fn gateway_lists_admin_user_api_keys_locally_with_trusted_admin_principal(
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )
@@ -1428,6 +1434,7 @@ async fn gateway_reveals_admin_user_full_key_locally_with_trusted_admin_principa
             Some(200),
             false,
             9,
+            0,
             1.5,
             false,
         )