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

backend/src/modules/iit-manager/services/QcReportService.ts

@@ -361,9 +361,19 @@ class QcReportServiceClass {
     const criticalIssues = seenCritical.size;
     const warningIssues = seenWarning.size;
 
-    // 计算通过率
-    const passedRecords = latestQcLogs.filter(log => 
-      log.status === 'PASS' || log.status === 'GREEN'
+    // V3.2: 按 record 级别计算通过率（每个 record 取最严重状态）
+    const statusPriority: Record<string, number> = { 'FAIL': 3, 'WARNING': 2, 'UNCERTAIN': 1, 'PASS': 0, 'GREEN': 0 };
+    const recordWorstStatus = new Map<string, string>();
+    for (const log of latestQcLogs) {
+      const existing = recordWorstStatus.get(log.record_id);
+      const currentPrio = statusPriority[log.status] ?? 0;
+      const existingPrio = existing ? (statusPriority[existing] ?? 0) : -1;
+      if (currentPrio > existingPrio) {
+        recordWorstStatus.set(log.record_id, log.status);
+      }
+    }
+    const passedRecords = [...recordWorstStatus.values()].filter(
+      s => s === 'PASS' || s === 'GREEN'
     ).length;
     const passRate = totalRecords > 0 
       ? Math.round((passedRecords / totalRecords) * 100 * 10) / 10