fix(version): 限制任务需求候选为版本已关联需求

apps/web/lib/requirement-selector.test.ts

@@ -1,7 +1,11 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
 
-import { getProjectAdoptedRequirementCandidates, mergeSelectedRequirementOptions } from './requirement-selector';
+import {
+  getProjectAdoptedRequirementCandidates,
+  getVersionLinkedRequirementCandidates,
+  mergeSelectedRequirementOptions,
+} from './requirement-selector';
 import type { Requirement } from './requirement';
 
 const base = {
@@ -38,6 +42,17 @@ test('returns only adopted requirements from current project', () => {
   assert.deepEqual(result.map((r: Requirement) => r.id), ['r1']);
 });
 
+test('returns only requirements already linked to current version', () => {
+  const result = getVersionLinkedRequirementCandidates([
+    req('r1', 'project-1', 'adopted'),
+    req('r2', 'project-1', 'developing'),
+    req('r3', 'project-1', 'adopted'),
+    req('r4', 'project-2', 'adopted'),
+  ], ['r2', 'r1']);
+
+  assert.deepEqual(result.map((r: Requirement) => r.id), ['r2', 'r1']);
+});
+
 test('keeps historical selected requirements as non-candidate options', () => {
   const options = mergeSelectedRequirementOptions(
     [req('r1', 'project-1', 'adopted')],

apps/web/lib/requirement-selector.ts

@@ -26,6 +26,22 @@ export function getProjectAdoptedRequirementCandidates(requirements: Requirement
     .sort((a, b) => a.code.localeCompare(b.code, 'zh-CN'));
 }
 
+export function getVersionLinkedRequirementCandidates(requirements: Requirement[], requirementIds: string[]): Requirement[] {
+  const linkedOrder = new Map<string, number>();
+  requirementIds.forEach((id, index) => {
+    if (!linkedOrder.has(id)) linkedOrder.set(id, index);
+  });
+
+  return requirements
+    .filter((r) => linkedOrder.has(r.id))
+    .sort((a, b) => {
+      const orderA = linkedOrder.get(a.id) ?? Number.MAX_SAFE_INTEGER;
+      const orderB = linkedOrder.get(b.id) ?? Number.MAX_SAFE_INTEGER;
+      if (orderA !== orderB) return orderA - orderB;
+      return a.code.localeCompare(b.code, 'zh-CN');
+    });
+}
+
 export function mergeSelectedRequirementOptions(
   candidates: Requirement[],
   allRequirements: Requirement[],