M0：灵台 Kernel 骨架（事件溯源/命台席位/瀑布总线/插件注册）与神识客户端边界，新增 POST /runs 占位闭环与测试，Alembic 基线合并为单一起点

backend/app/shenshi_client/__init__.py

@@ -0,0 +1,25 @@
+"""神识客户端边界（灵台唯一模型出口）。"""
+
+from app.shenshi_client.client import (
+    EchoShenshi,
+    HttpShenshiClient,
+    ShenshiClient,
+    build_shenshi_client,
+)
+from app.shenshi_client.types import (
+    ShenshiChatRequest,
+    ShenshiDelta,
+    ShenshiError,
+    ShenshiMessage,
+)
+
+__all__ = [
+    "EchoShenshi",
+    "HttpShenshiClient",
+    "ShenshiChatRequest",
+    "ShenshiClient",
+    "ShenshiDelta",
+    "ShenshiError",
+    "ShenshiMessage",
+    "build_shenshi_client",
+]