feat(y-log): 问答按 LLM 调用各记一条 + 全量补齐各 API 操作埋点

- 问答日志从「每轮 onFinish 一条」改为 useThreadStream onLangChainEvent
  监听 on_chat_model_end，每次大模型调用结束各上报一条（含子代理）
- 广覆盖各 API client 成功路径：查看(view)/查询(search)/新增(create)/
  编辑(edit)/删除(delete)/启停(enabled·disabled)/导入导出，补齐此前
  整模块零埋点与漏掉的单条详情 GET；跳过高频 typeahead/轮询/bootstrap

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/core/models/api.ts

@@ -1,13 +1,21 @@
 import { getBackendBaseURL } from "../config";
 import { apiFetch } from "../api";
+import { OptType, writeYLog } from "../log/y-log";
 
 import type { ModelsResponse } from "./types";
 
 export async function loadModels(): Promise<ModelsResponse> {
   const res = await apiFetch(`${getBackendBaseURL()}/api/models`);
   const data = (await res.json()) as Partial<ModelsResponse>;
-  return {
+  const result: ModelsResponse = {
     models: data.models ?? [],
     token_usage: data.token_usage ?? { enabled: false },
   };
+  writeYLog({
+    optType: OptType.search,
+    optDetail: "B1-CM助手-模型-查询",
+    url: "/api/models",
+    returnParam: result,
+  });
+  return result;
 }