refactor(frontend): clarify toVM/PROCEED 提取到 clarify.ts 共享（WFW-9 M2）

apps/web/lib/workbench/useClarify.ts

@@ -3,10 +3,7 @@
 import { useCallback, useState } from "react";
 
 import { api } from "@/lib/api/client";
-import type { ClarifyDecisionVM } from "./clarify";
-
-// 澄清预检结论为「放行」（直接去 refine，不反问）——后端 error/前端异常时的确定性回退。
-const PROCEED: ClarifyDecisionVM = { needClarification: false, questions: [] };
+import { PROCEED, toVM, type ClarifyDecisionVM } from "./clarify";
 
 export type ClarifyStatus = "idle" | "checking" | "asking" | "proceed" | "error";
 
@@ -24,30 +21,6 @@ export interface UseClarify {
   reset: () => void;
 }
 
-// 后端 snake_case ClarifyDecision → 前端 camelCase VM（不信任外部数据，全部显式取值 + 默认）。
-function toVM(data: {
-  need_clarification?: boolean;
-  questions?: {
-    question?: string;
-    options?: { label?: string; value?: string }[];
-    allow_free_text?: boolean;
-  }[];
-  verification?: string | null;
-}): ClarifyDecisionVM {
-  return {
-    needClarification: Boolean(data.need_clarification),
-    questions: (data.questions ?? []).map((q) => ({
-      question: q.question ?? "",
-      options: (q.options ?? []).map((o) => ({
-        label: o.label ?? "",
-        value: o.value ?? "",
-      })),
-      allowFreeText: Boolean(q.allow_free_text),
-    })),
-    verification: data.verification ?? undefined,
-  };
-}
-
 // AI 反问澄清预检（WFW-9 M1，路线A 两阶段之「问题」阶段）。
 // 「再沟通」意见含糊/极短时先调独立非流式端点让 AI 反问；needClarification=false 或失败=放行去既有 refine。
 export function useClarify(): UseClarify {