fix(ai): 拆解原型无需求ID任务

apps/web/lib/ai-decompose-adoption.ts

@@ -0,0 +1,46 @@
+import type { AgentReference } from '@ftb/shared';
+
+export interface DecomposeAdoptionRequirement {
+  id: string;
+  code: string;
+  title: string;
+}
+
+export interface DecomposeDraftRequirementInput {
+  requirementName?: string;
+  references: AgentReference[];
+}
+
+export interface DecomposeDraftRequirementFields {
+  requirementId: string;
+  requirementName?: string;
+}
+
+export function resolveDecomposeDraftRequirementFields(
+  draft: DecomposeDraftRequirementInput,
+  requirements: DecomposeAdoptionRequirement[],
+): DecomposeDraftRequirementFields {
+  const reqRef = draft.references.find((ref) => ref.type === 'requirement');
+  if (reqRef) {
+    const requirement = requirements.find((item) => item.id === reqRef.id || item.code === reqRef.id);
+    return {
+      requirementId: requirement?.id ?? reqRef.id,
+      requirementName: undefined,
+    };
+  }
+
+  return {
+    requirementId: '',
+    requirementName: normalizePrototypeOnlyRequirementName(draft.requirementName, draft.references),
+  };
+}
+
+function normalizePrototypeOnlyRequirementName(
+  requirementName: string | undefined,
+  references: AgentReference[],
+): string {
+  const trimmed = requirementName?.trim();
+  if (trimmed) return trimmed;
+  const note = references.find((ref) => ref.type === 'prototype_note');
+  return note?.label?.trim() || note?.id?.trim() || '未命名需求';
+}