refactor: 拆分 admin handler 大文件为模块目录，消除 shared.rs 反模式

- endpoint_keys/pool/architecture 等大文件拆分为独立模块目录
- 删除 crud/query/strategy/system 中的 shared.rs，内容归位到各自模块
- endpoints_admin/models/oauth/write 等模块拆出 payloads/responses/support 子文件
- system/core 下多个 *_routes.rs 合并到 system_routes.rs
- 更新 refactor-execution-plan 文档进度

apps/aether-gateway/src/handlers/admin/provider/strategy/builders.rs

@@ -1,5 +1,6 @@
-use super::super::write::{normalize_provider_billing_type, parse_optional_rfc3339_unix_secs};
-use super::shared::admin_provider_strategy_provider_not_found_response;
+use crate::handlers::admin::provider::shared::support::{
+    normalize_provider_billing_type, parse_optional_rfc3339_unix_secs,
+};
 use crate::handlers::admin::shared::unix_secs_to_rfc3339;
 use crate::{AppState, GatewayError};
 use axum::{
@@ -257,3 +258,11 @@ pub(super) async fn build_provider_strategy_reset_quota_response(
     }))
     .into_response())
 }
+
+fn admin_provider_strategy_provider_not_found_response() -> Response<Body> {
+    (
+        http::StatusCode::NOT_FOUND,
+        Json(json!({ "detail": "Provider not found" })),
+    )
+        .into_response()
+}

apps/aether-gateway/src/handlers/admin/provider/strategy/mod.rs

@@ -4,8 +4,8 @@ use axum::body::{Body, Bytes};
 use axum::http::Response;
 
 mod builders;
+mod responses;
 mod routes;
-mod shared;
 
 pub(crate) async fn maybe_build_local_admin_provider_strategy_response(
     state: &AppState,

apps/aether-gateway/src/handlers/admin/provider/strategy/responses.rs

@@ -1,10 +1,5 @@
 use crate::handlers::admin::shared::build_proxy_error_response;
-use axum::{
-    body::Body,
-    http,
-    response::{IntoResponse, Response},
-    Json,
-};
+use axum::{body::Body, http, response::Response};
 use serde_json::json;
 
 pub(super) const ADMIN_PROVIDER_STRATEGY_DATA_UNAVAILABLE_DETAIL: &str =
@@ -20,19 +15,3 @@ pub(super) fn admin_provider_strategy_data_unavailable_response(detail: &str) ->
         Some(json!({ "error": detail })),
     )
 }
-
-pub(super) fn admin_provider_strategy_provider_not_found_response() -> Response<Body> {
-    (
-        http::StatusCode::NOT_FOUND,
-        Json(json!({ "detail": "Provider not found" })),
-    )
-        .into_response()
-}
-
-pub(super) fn admin_provider_strategy_dispatcher_not_found_response() -> Response<Body> {
-    (
-        http::StatusCode::NOT_FOUND,
-        Json(json!({ "detail": "Provider strategy route not found" })),
-    )
-        .into_response()
-}

apps/aether-gateway/src/handlers/admin/provider/strategy/routes.rs

@@ -3,15 +3,13 @@ use super::builders::{
     build_provider_strategy_stats_response, build_provider_strategy_update_billing_response,
     AdminProviderStrategyBillingRequest,
 };
-use super::shared::{
+use super::responses::{
     admin_provider_strategy_data_unavailable_response,
-    admin_provider_strategy_dispatcher_not_found_response,
-    admin_provider_strategy_provider_not_found_response,
     ADMIN_PROVIDER_STRATEGY_DATA_UNAVAILABLE_DETAIL,
     ADMIN_PROVIDER_STRATEGY_STATS_DATA_UNAVAILABLE_DETAIL,
 };
 use crate::control::GatewayPublicRequestContext;
-use crate::handlers::admin::provider::shared::{
+use crate::handlers::admin::provider::shared::paths::{
     admin_provider_id_for_provider_strategy_billing, admin_provider_id_for_provider_strategy_quota,
     admin_provider_id_for_provider_strategy_stats, is_admin_provider_strategy_strategies_root,
 };
@@ -134,3 +132,19 @@ pub(super) async fn maybe_build_local_admin_provider_strategy_response(
 
     Ok(Some(admin_provider_strategy_dispatcher_not_found_response()))
 }
+
+fn admin_provider_strategy_provider_not_found_response() -> Response<Body> {
+    (
+        http::StatusCode::NOT_FOUND,
+        Json(json!({ "detail": "Provider not found" })),
+    )
+        .into_response()
+}
+
+fn admin_provider_strategy_dispatcher_not_found_response() -> Response<Body> {
+    (
+        http::StatusCode::NOT_FOUND,
+        Json(json!({ "detail": "Provider strategy route not found" })),
+    )
+        .into_response()
+}