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/prisma/schema.prisma

@@ -948,6 +948,8 @@ model IitProject {
   redcapApiToken  String             @map("redcap_api_token")
   redcapUrl       String             @map("redcap_url")
   lastSyncAt      DateTime?          @map("last_sync_at")
+  cronEnabled     Boolean            @default(false) @map("cron_enabled")
+  cronExpression  String?            @map("cron_expression")
   status          String             @default("active")
   createdAt       DateTime           @default(now()) @map("created_at")
   updatedAt       DateTime           @updatedAt @map("updated_at")
@@ -1426,6 +1428,97 @@ model IitQcProjectStats {
   @@schema("iit_schema")
 }
 
+/// eQuery 表 - AI 自动生成的电子质疑，具有完整生命周期
+model IitEquery {
+  id              String   @id @default(uuid())
+  projectId       String   @map("project_id")
+  
+  // 来源
+  recordId        String   @map("record_id")
+  eventId         String?  @map("event_id")
+  formName        String?  @map("form_name")
+  fieldName       String?  @map("field_name")
+  qcLogId         String?  @map("qc_log_id")
+  reportId        String?  @map("report_id")
+  
+  // 质疑内容
+  queryText       String   @map("query_text") @db.Text
+  expectedAction  String?  @map("expected_action") @db.Text
+  severity        String   @default("warning")
+  category        String?
+  
+  // 状态机: pending → responded → reviewing → closed / reopened
+  status          String   @default("pending")
+  
+  // CRC 回复
+  assignedTo      String?  @map("assigned_to")
+  respondedAt     DateTime? @map("responded_at")
+  responseText    String?  @map("response_text") @db.Text
+  responseData    Json?    @map("response_data") @db.JsonB
+  
+  // AI 复核
+  reviewResult    String?  @map("review_result")
+  reviewNote      String?  @map("review_note") @db.Text
+  reviewedAt      DateTime? @map("reviewed_at")
+  
+  // 关闭
+  closedAt        DateTime? @map("closed_at")
+  closedBy        String?   @map("closed_by")
+  resolution      String?   @db.Text
+  
+  // 时间线
+  createdAt       DateTime @default(now()) @map("created_at")
+  updatedAt       DateTime @updatedAt @map("updated_at")
+  
+  @@index([projectId], map: "idx_iit_equery_project")
+  @@index([projectId, status], map: "idx_iit_equery_project_status")
+  @@index([recordId], map: "idx_iit_equery_record")
+  @@index([assignedTo], map: "idx_iit_equery_assigned")
+  @@map("equery")
+  @@schema("iit_schema")
+}
+
+/// 重大事件归档表 - SAE、重大方案偏离等长期临床资产
+model IitCriticalEvent {
+  id              String   @id @default(uuid())
+  projectId       String   @map("project_id")
+  recordId        String   @map("record_id")
+  
+  // 事件分类
+  eventType       String   @map("event_type")
+  severity        String   @default("critical")
+  
+  // 事件内容
+  title           String
+  description     String   @db.Text
+  detectedAt      DateTime @map("detected_at")
+  detectedBy      String   @default("ai") @map("detected_by")
+  
+  // 来源追溯
+  sourceQcLogId   String?  @map("source_qc_log_id")
+  sourceEqueryId  String?  @map("source_equery_id")
+  sourceData      Json?    @map("source_data") @db.JsonB
+  
+  // 处理状态
+  status          String   @default("open")
+  handledBy       String?  @map("handled_by")
+  handledAt       DateTime? @map("handled_at")
+  handlingNote    String?  @map("handling_note") @db.Text
+  
+  // 上报追踪
+  reportedToEc    Boolean  @default(false) @map("reported_to_ec")
+  reportedAt      DateTime? @map("reported_at")
+  
+  createdAt       DateTime @default(now()) @map("created_at")
+  updatedAt       DateTime @updatedAt @map("updated_at")
+  
+  @@index([projectId], map: "idx_iit_critical_event_project")
+  @@index([projectId, eventType], map: "idx_iit_critical_event_type")
+  @@index([projectId, status], map: "idx_iit_critical_event_status")
+  @@map("critical_events")
+  @@schema("iit_schema")
+}
+
 model admin_operation_logs {
   id             Int      @id @default(autoincrement())
   admin_id       String