refactor: 大规模模块拆分与代码精简，新增 ai-pipeline/data-contracts 独立 crate

- 新增 aether-ai-pipeline 和 aether-data-contracts crate，将 pipeline 逻辑与数据契约从 gateway 中解耦
- 重构 admin handlers：拆分单体模块为 auth/billing/endpoint/features/model/observability/provider/system 等独立子模块
- 合并 chat/cli 重复代码路径：精简 conversion、finalize、planner 中的 sync/chat/cli 分支
- 重构 scheduler/executor/data 层，引入 facade 模式降低模块间耦合
- 移除冗余的 intent 模块，将 plan_fallback/policy/stream_path/sync_path 迁移至 executor
- 前端适配：调整 admin API 调用和 provider 模型测试对话框

apps/aether-gateway/src/model_fetch/runtime.rs

@@ -3,7 +3,7 @@ use std::time::Duration;
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use aether_contracts::ExecutionResult;
-use aether_data::repository::provider_catalog::{
+use aether_data_contracts::repository::provider_catalog::{
     StoredProviderCatalogEndpoint, StoredProviderCatalogKey, StoredProviderCatalogProvider,
 };
 use aether_model_fetch::{

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

@@ -1,18 +1,16 @@
 use aether_contracts::{ExecutionPlan, ExecutionResult, ProxySnapshot};
-use aether_data::repository::global_models::{
+use aether_data_contracts::repository::global_models::{
     AdminGlobalModelListQuery, AdminProviderModelListQuery, StoredAdminGlobalModelPage,
     StoredAdminProviderModel, UpsertAdminProviderModelRecord,
 };
-use aether_data::repository::provider_catalog::{
+use aether_data_contracts::repository::provider_catalog::{
     StoredProviderCatalogEndpoint, StoredProviderCatalogKey, StoredProviderCatalogProvider,
 };
 use aether_model_fetch::{ModelFetchAssociationStore, ModelFetchTransportRuntime};
 use async_trait::async_trait;
 use serde_json::Value;
 
-use crate::provider_transport::{
-    GatewayProviderTransportSnapshot, LocalResolvedOAuthRequestAuth,
-};
+use crate::provider_transport::{GatewayProviderTransportSnapshot, LocalResolvedOAuthRequestAuth};
 use crate::{AppState, GatewayError};
 
 #[async_trait]

apps/aether-gateway/src/model_fetch/tests.rs

@@ -3,13 +3,15 @@ use std::time::Duration;
 
 use aether_contracts::ExecutionPlan;
 use aether_crypto::{encrypt_python_fernet_plaintext, DEVELOPMENT_ENCRYPTION_KEY};
-use aether_data::repository::global_models::{
-    GlobalModelReadRepository, InMemoryGlobalModelReadRepository, StoredAdminGlobalModel,
+use aether_data::repository::global_models::InMemoryGlobalModelReadRepository;
+use aether_data::repository::provider_catalog::InMemoryProviderCatalogReadRepository;
+use aether_data_contracts::repository::global_models::{
+    AdminProviderModelListQuery, GlobalModelReadRepository, StoredAdminGlobalModel,
     StoredAdminProviderModel,
 };
-use aether_data::repository::provider_catalog::{
-    InMemoryProviderCatalogReadRepository, ProviderCatalogReadRepository,
-    StoredProviderCatalogEndpoint, StoredProviderCatalogKey, StoredProviderCatalogProvider,
+use aether_data_contracts::repository::provider_catalog::{
+    ProviderCatalogReadRepository, StoredProviderCatalogEndpoint, StoredProviderCatalogKey,
+    StoredProviderCatalogProvider,
 };
 use axum::routing::any;
 use axum::{extract::Request, Json, Router};
@@ -286,14 +288,12 @@ async fn gateway_model_fetch_updates_key_and_syncs_provider_model_whitelist_asso
     assert!(updated_key.last_models_fetch_at_unix_secs.is_some());
 
     let provider_models = global_model_repository
-        .list_admin_provider_models(
-            &aether_data::repository::global_models::AdminProviderModelListQuery {
-                provider_id: "provider-openai".to_string(),
-                is_active: None,
-                offset: 0,
-                limit: 10_000,
-            },
-        )
+        .list_admin_provider_models(&AdminProviderModelListQuery {
+            provider_id: "provider-openai".to_string(),
+            is_active: None,
+            offset: 0,
+            limit: 10_000,
+        })
         .await
         .expect("provider models should load");
     assert_eq!(provider_models.len(), 1);
@@ -514,14 +514,12 @@ async fn gateway_background_model_fetch_updates_key_and_syncs_provider_model_whi
     assert_eq!(updated_key.last_models_fetch_error, None);
 
     let provider_models = global_model_repository
-        .list_admin_provider_models(
-            &aether_data::repository::global_models::AdminProviderModelListQuery {
-                provider_id: "provider-openai".to_string(),
-                is_active: None,
-                offset: 0,
-                limit: 10_000,
-            },
-        )
+        .list_admin_provider_models(&AdminProviderModelListQuery {
+            provider_id: "provider-openai".to_string(),
+            is_active: None,
+            offset: 0,
+            limit: 10_000,
+        })
         .await
         .expect("provider models should load");
     assert_eq!(provider_models.len(), 1);