feat(iit): Complete CRA Agent V3.0 P0 milestone - autonomous QC pipeline

P0-1: Variable list sync from REDCap metadata
P0-2: QC rule configuration with JSON Logic + AI suggestion
P0-3: Scheduled QC + report generation + eQuery closed loop
P0-4: Unified dashboard + AI stream timeline + critical events

Backend:
- Add IitEquery, IitCriticalEvent Prisma models + migration
- Add cronEnabled/cronExpression to IitProject
- Implement eQuery service/controller/routes (CRUD + respond/review/close)
- Implement DailyQcOrchestrator (report -> eQuery -> critical events -> notify)
- Add AI rule suggestion service
- Register daily QC cron worker and eQuery auto-review worker
- Extend QC cockpit with timeline, trend, critical events APIs
- Fix timeline issues field compat (object vs array format)

Frontend:
- Create IIT business module with 6 pages (Dashboard, AI Stream, eQuery,
  Reports, Variable List + project config pages)
- Migrate IIT config from admin panel to business module
- Implement health score, risk heatmap, trend chart, critical event alerts
- Register IIT module in App router and top navigation

Testing:
- Add E2E API test script covering 7 modules (46 assertions, all passing)

Tested: E2E API tests 46/46 passed, backend and frontend verified
Made-with: Cursor

backend/src/modules/admin/iit-projects/iitProjectController.ts

@@ -286,6 +286,64 @@ export async function syncMetadata(
   }
 }
 
+/**
+ * 获取字段元数据列表
+ */
+export async function listFieldMetadata(
+  request: FastifyRequest<{
+    Params: ProjectIdParams;
+    Querystring: { formName?: string; search?: string };
+  }>,
+  reply: FastifyReply
+) {
+  try {
+    const { id } = request.params;
+    const { formName, search } = request.query as { formName?: string; search?: string };
+
+    const where: any = { projectId: id };
+    if (formName) {
+      where.formName = formName;
+    }
+    if (search) {
+      where.OR = [
+        { fieldName: { contains: search, mode: 'insensitive' } },
+        { fieldLabel: { contains: search, mode: 'insensitive' } },
+      ];
+    }
+
+    const [fields, total] = await Promise.all([
+      prisma.iitFieldMetadata.findMany({
+        where,
+        orderBy: [{ formName: 'asc' }, { fieldName: 'asc' }],
+      }),
+      prisma.iitFieldMetadata.count({ where }),
+    ]);
+
+    const forms = await prisma.iitFieldMetadata.findMany({
+      where: { projectId: id },
+      select: { formName: true },
+      distinct: ['formName'],
+      orderBy: { formName: 'asc' },
+    });
+
+    return reply.send({
+      success: true,
+      data: {
+        fields,
+        total,
+        forms: forms.map(f => f.formName),
+      },
+    });
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    logger.error('获取字段元数据失败', { error: message });
+    return reply.status(500).send({
+      success: false,
+      error: message,
+    });
+  }
+}
+
 /**
  * 关联知识库
  */