feat(iit): QC deep fix + V3.1 architecture plan + project member management

QC System Deep Fix:
- HardRuleEngine: add null tolerance + field availability pre-check (skipped status)
- SkillRunner: baseline data merge for follow-up events + field availability check
- QcReportService: record-level pass rate calculation + accurate LLM XML report
- iitBatchController: legacy log cleanup (eventId=null) + upsert RecordSummary
- seed-iit-qc-rules: null/empty string tolerance + applicableEvents config

V3.1 Architecture Design (docs only, no code changes):
- QC engine V3.1 plan: 5-level data structure (CDISC ODM) + D1-D7 dimensions
- Three-batch implementation strategy (A: foundation, B: bubbling, C: new engines)
- Architecture team review: 4 whitepapers reviewed + feedback doc + 4 critical suggestions
- CRA Agent strategy roadmap + CRA 4-tool explanation doc for clinical experts

Project Member Management:
- Cross-tenant member search and assignment (remove tenant restriction)
- IIT project detail page enhancement with tabbed layout (KB + members)
- IitProjectContext for business-side project selection
- System-KB route access control adjustment for project operators

Frontend:
- AdminLayout sidebar menu restructure
- IitLayout with project context provider
- IitMemberManagePage new component
- Business-side pages adapt to project context

Prisma:
- 2 new migrations (user-project RBAC + is_demo flag)
- Schema updates for project member management

Made-with: Cursor

frontend-v2/src/App.tsx

@@ -28,6 +28,7 @@ import SystemKbDetailPage from './modules/admin/pages/SystemKbDetailPage'
 import IitProjectListPage from './modules/admin/pages/IitProjectListPage'
 import IitProjectDetailPage from './modules/admin/pages/IitProjectDetailPage'
 import IitQcCockpitPage from './modules/admin/pages/IitQcCockpitPage'
+import IitMemberManagePage from './modules/admin/pages/IitMemberManagePage'
 // 运营日志
 import ActivityLogsPage from './pages/admin/ActivityLogsPage'
 // 个人中心页面
@@ -129,6 +130,8 @@ function App() {
                   <Route path="iit-projects" element={<IitProjectListPage />} />
                   <Route path="iit-projects/:id" element={<IitProjectDetailPage />} />
                   <Route path="iit-projects/:id/cockpit" element={<IitQcCockpitPage />} />
+                  {/* IIT 项目人员管理 */}
+                  <Route path="iit-members" element={<IitMemberManagePage />} />
                   {/* 运营日志 */}
                   <Route path="activity-logs" element={<ActivityLogsPage />} />
                   {/* 系统配置 */}