feat(版本): 优化概览与只读状态

关键改动：

- 增加需求排序和版本只读状态规则及测试

- 完善版本概览阶段耗时、项目页和工作台展示

- 优化小宝预警请求节流、建议状态和风险过滤

Co-Authored-By: Codex GPT-5 <codex@openai.com>

apps/web/app/requirements/page.tsx

@@ -12,6 +12,7 @@ import { REQ_STATUS_LABEL, REQ_STATUS_COLOR, SOURCE_TYPE_LABEL } from '@/lib/req
 import type { Requirement, RequirementStatus, SourceType } from '@/lib/requirement';
 import { deriveReqDevStatus, canEditRequirement, canCloseRequirement, REQ_DEV_STATUS_LABEL, REQ_DEV_STATUS_COLOR } from '@/lib/linkage-engine';
 import { buildRequirementScopeTree, filterRequirementsByScope, type RequirementProductScopeNode, type RequirementScopeSelection } from '@/lib/requirement-scope';
+import { sortRequirementsByCreatedAt, type RequirementDateSort } from '@/lib/requirement-sort';
 import { Pagination, usePagination } from '@/components/Pagination';
 import { RequirementModal } from '@/components/requirement/RequirementModal';
 import { RequirementDetail } from '@/components/requirement/RequirementDetail';
@@ -184,7 +185,7 @@ function RequirementsPageContent() {
   const [drawerType, setDrawerType] = useState<null | 'source' | 'type' | 'platform'>(null);
   const [rejectingReq, setRejectingReq] = useState<Requirement | null>(null);
   const [rejectReason, setRejectReason] = useState('');
-  const [dateSort, setDateSort] = useState<'desc' | 'asc'>('desc');
+  const [dateSort, setDateSort] = useState<RequirementDateSort>('desc');
 
   useEffect(() => { fetchOverview(); }, [fetchOverview]);
   useEffect(() => { fetchRequirements(); }, [fetchRequirements]);
@@ -268,11 +269,7 @@ function RequirementsPageContent() {
       list = list.filter((r) => r.versionId === versionFilter);
     }
 
-    // sort by createdAt
-    list.sort((a, b) => {
-      const diff = new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime();
-      return dateSort === 'asc' ? diff : -diff;
-    });
+    list = sortRequirementsByCreatedAt(list, dateSort);
 
     return list;
   }, [scopedRequirements, search, statusFilter, priorityFilter, typeFilter, versionFilter, dateSort, devTasks]);