feat: 计划转交功能 + 关联需求增强（描述/变更/类型/日期）

一、调研/产品方案/UI设计 - 转交功能：
- 未开始/进行中状态可转交给其他参与人员
- 转交按钮打开内联选择器，从 version.members 选人
- 确认后更新 plan.owner

二、关联需求表格增强：
- 描述列：超出宽度省略号，hover 显示完整 title 属性
- 需求类型列：原始需求（灰色）/ 变更需求（橙色）
- 变更原因列：显示变更原因标签
- 添加日期列：显示 createdAt

三、需求变更功能：
- 新增"需求变更"按钮（橙色边框）
- 变更表单：变更人员（从参与人员选）、变更原因（6种）、
  需求概述、需求详细
- 变更原因选项：需求理解偏差导致返工、反馈导致返工、
  实现难度超预期、上游交付延误、范围蔓延、其他
- 创建后自动关联到当前版本，标记为变更需求

四、数据模型扩展（lib/requirement.ts）：
- 新增 reqType: 'original' | 'change'
- 新增 changeReason: ChangeReason
- 新增 changeBy: string
- 导出 CHANGE_REASON_LABEL 常量

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/versions/[id]/page.tsx

@@ -52,7 +52,7 @@ export default function VersionDetailPage() {
   const router = useRouter();
   const versionId = params.id as string;
   const { overview, fetchOverview, updateVersion, deleteVersion } = useProductStore();
-  const { requirements, fetchRequirements, updateRequirement } = useRequirementStore();
+  const { requirements, fetchRequirements, updateRequirement, createRequirement } = useRequirementStore();
   const { records, fetchRecords } = useOvertimeStore();
   const { plans, fetchPlans, createPlan, updatePlan, completePlan, deletePlan } = useVersionPlanStore();
   const { tasks: devTasks, fetchTasks: fetchDevTasks, deleteTask: deleteDevTask } = useDevTaskStore();
@@ -751,11 +751,30 @@ export default function VersionDetailPage() {
             projectId={version.projectId}
             requirements={requirements}
             devTasks={devTasks}
+            versionMembers={version.members ?? []}
             currentUserName={user?.name ?? ''}
             onLink={(ids, addedBy) => {
               ids.forEach((id) => updateRequirement(id, { versionId: version.id, addedToVersionBy: addedBy }));
             }}
             onUnlink={(id) => updateRequirement(id, { versionId: undefined, addedToVersionBy: undefined })}
+            onCreateChange={(data) => {
+              createRequirement({
+                ...data,
+                productId: version.productId,
+                projectId: version.projectId,
+                versionId: version.id,
+                sourceType: 'internal',
+                sourceTarget: '',
+                platforms: [],
+                typeId: '',
+                status: 'adopted',
+                priority: 'P2',
+                effort: 'M',
+                creator: user?.name ?? '',
+                addedToVersionBy: user?.name ?? '',
+                reqType: 'change',
+              } as any);
+            }}
           />
         ) : (activeTab === 'research' || activeTab === 'product' || activeTab === 'ui') ? (
           (() => {
@@ -769,6 +788,7 @@ export default function VersionDetailPage() {
                 versionDeadline={version.expectedReleaseDate ?? undefined}
                 currentUserName={user?.name ?? ''}
                 planType={pt}
+                versionMembers={version.members ?? []}
                 linkedRequirements={pt !== 'research' ? linkedReqs : undefined}
                 onCreate={(data) => {
                   createPlan(data);