M2b：删除旧 chat 体系——线性会话/叩心/情绪/纪念日模型与页面退役（迁移 003 双向验证），runs 去会话外键，测试全量修剪

frontend/src/lib/api/index.ts

@@ -8,7 +8,6 @@
 export * from "./client";
 export * as audioApi from "./audio";
 export * as charactersApi from "./characters";
-export * as chatApi from "./chat";
 export * as runsApi from "./runs";
 export * as sandboxApi from "./sandbox";
 export * as memoryApi from "./memory";
@@ -26,4 +25,3 @@ export * as worldApi from "./world";
 export * as lorebooksApi from "./lorebooks";
 export * as skillsApi from "./skills";
 export * as mcpApi from "./mcp";
-export * as timeApi from "./time";