refactor: 拆分 gateway 单体为独立 crate，新增 systemd 部署方案

将 gateway 内部的 model-fetch、provider-transport、scheduler-core、
usage-runtime、video-tasks-core 模块提取为独立 crate；重构 gateway
内部模块结构（state/router/cache/data/query 等）；移除大量遗留模块
文件；新增 systemd 二进制部署骨架及相关文档；更新前端 usage 相关
API 和组件。

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

@@ -5,6 +5,19 @@ mod types;
 pub use memory::InMemoryWalletRepository;
 pub use sql::SqlxWalletRepository;
 pub use types::{
-    StoredUsageSettlement, StoredWalletSnapshot, UsageSettlementInput, WalletLookupKey,
+    AdjustWalletBalanceInput, AdminPaymentCallbackRecord, AdminPaymentOrderListQuery,
+    AdminWalletLedgerQuery, AdminWalletListQuery, AdminWalletPaymentOrderRecord,
+    AdminWalletRefundRecord, AdminWalletRefundRequestListQuery, AdminWalletTransactionRecord,
+    CompleteAdminWalletRefundInput, CreateManualWalletRechargeInput,
+    CreateWalletRechargeOrderInput, CreateWalletRechargeOrderOutcome,
+    CreateWalletRefundRequestInput, CreateWalletRefundRequestOutcome, CreditAdminPaymentOrderInput,
+    FailAdminWalletRefundInput, ProcessAdminWalletRefundInput, ProcessPaymentCallbackInput,
+    ProcessPaymentCallbackOutcome, StoredAdminPaymentCallback, StoredAdminPaymentCallbackPage,
+    StoredAdminPaymentOrder, StoredAdminPaymentOrderPage, StoredAdminWalletLedgerItem,
+    StoredAdminWalletLedgerPage, StoredAdminWalletListItem, StoredAdminWalletListPage,
+    StoredAdminWalletRefund, StoredAdminWalletRefundPage, StoredAdminWalletRefundRequestItem,
+    StoredAdminWalletRefundRequestPage, StoredAdminWalletTransaction,
+    StoredAdminWalletTransactionPage, StoredWalletDailyUsageLedger,
+    StoredWalletDailyUsageLedgerPage, StoredWalletSnapshot, WalletLookupKey, WalletMutationOutcome,
     WalletReadRepository, WalletRepository, WalletWriteRepository,
 };