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/tests/ai_execute/sync/chat/local_decision.rs

@@ -859,8 +859,12 @@ async fn gateway_executes_openai_chat_sync_via_local_openai_compact_cross_format
         url: String,
         provider_model: String,
         api_key: String,
+        x_client_request_id: String,
+        session_id: String,
+        conversation_id: String,
         instructions: String,
         user_text: String,
+        prompt_cache_key: String,
         stream_present: bool,
     }
 
@@ -1099,6 +1103,24 @@ async fn gateway_executes_openai_chat_sync_via_local_openai_compact_cross_format
                         .and_then(|value| value.as_str())
                         .unwrap_or_default()
                         .to_string(),
+                    x_client_request_id: payload
+                        .get("headers")
+                        .and_then(|value| value.get("x-client-request-id"))
+                        .and_then(|value| value.as_str())
+                        .unwrap_or_default()
+                        .to_string(),
+                    session_id: payload
+                        .get("headers")
+                        .and_then(|value| value.get("session_id"))
+                        .and_then(|value| value.as_str())
+                        .unwrap_or_default()
+                        .to_string(),
+                    conversation_id: payload
+                        .get("headers")
+                        .and_then(|value| value.get("conversation_id"))
+                        .and_then(|value| value.as_str())
+                        .unwrap_or_default()
+                        .to_string(),
                     instructions: payload
                         .get("body")
                         .and_then(|value| value.get("json_body"))
@@ -1119,6 +1141,13 @@ async fn gateway_executes_openai_chat_sync_via_local_openai_compact_cross_format
                         .and_then(|value| value.as_str())
                         .unwrap_or_default()
                         .to_string(),
+                    prompt_cache_key: payload
+                        .get("body")
+                        .and_then(|value| value.get("json_body"))
+                        .and_then(|value| value.get("prompt_cache_key"))
+                        .and_then(|value| value.as_str())
+                        .unwrap_or_default()
+                        .to_string(),
                     stream_present: payload
                         .get("body")
                         .and_then(|value| value.get("json_body"))
@@ -1260,6 +1289,19 @@ async fn gateway_executes_openai_chat_sync_via_local_openai_compact_cross_format
         seen_execution_runtime_request.api_key,
         "sk-upstream-openai-chat-compact"
     );
+    assert_eq!(
+        seen_execution_runtime_request.x_client_request_id,
+        "trace-openai-chat-compact-local-123"
+    );
+    assert_eq!(
+        seen_execution_runtime_request.prompt_cache_key,
+        "ee016aa9-7fc4-5432-957e-b34172d3bfd8"
+    );
+    assert_eq!(
+        seen_execution_runtime_request.session_id,
+        "7916c4f51c45a74c"
+    );
+    assert!(seen_execution_runtime_request.conversation_id.is_empty());
     assert_eq!(
         seen_execution_runtime_request.instructions,
         "You are terse."

apps/aether-gateway/src/tests/ai_execute/sync/chat/mod.rs

@@ -26,16 +26,17 @@ use aether_crypto::{encrypt_python_fernet_plaintext, DEVELOPMENT_ENCRYPTION_KEY}
 use aether_data::repository::auth::{
     InMemoryAuthApiKeySnapshotRepository, StoredAuthApiKeySnapshot,
 };
-use aether_data::repository::candidate_selection::{
-    InMemoryMinimalCandidateSelectionReadRepository, StoredMinimalCandidateSelectionRow,
-    StoredProviderModelMapping,
+use aether_data::repository::candidate_selection::InMemoryMinimalCandidateSelectionReadRepository;
+use aether_data::repository::candidates::InMemoryRequestCandidateRepository;
+use aether_data::repository::provider_catalog::InMemoryProviderCatalogReadRepository;
+use aether_data_contracts::repository::candidate_selection::{
+    StoredMinimalCandidateSelectionRow, StoredProviderModelMapping,
 };
-use aether_data::repository::candidates::{
-    InMemoryRequestCandidateRepository, RequestCandidateReadRepository, RequestCandidateStatus,
+use aether_data_contracts::repository::candidates::{
+    RequestCandidateReadRepository, RequestCandidateStatus,
 };
-use aether_data::repository::provider_catalog::{
-    InMemoryProviderCatalogReadRepository, StoredProviderCatalogEndpoint, StoredProviderCatalogKey,
-    StoredProviderCatalogProvider,
+use aether_data_contracts::repository::provider_catalog::{
+    StoredProviderCatalogEndpoint, StoredProviderCatalogKey, StoredProviderCatalogProvider,
 };
 use sha2::{Digest, Sha256};