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

docs/01-平台基础层/07-数据库/01-Prisma迁移历史与变更日志.md

@@ -8,7 +8,7 @@
 
 ## 1. 迁移时间线总览
 
-当前共 **14 个已应用迁移**，覆盖 2025-10 至 2026-02 的演进过程。
+当前共 **15 个已应用迁移**，覆盖 2025-10 至 2026-02 的演进过程。
 
 ```
 2025-10  ████ init + conversations + batch + review_tasks
@@ -140,6 +140,15 @@
 | 核心内容 | 对齐 Schema 类型注解与数据库实际类型：ssa_workflows/ssa_workflow_steps 的 VARCHAR 长度和 TIMESTAMP 精度 + 清理 2 个重复外键 |
 | 性质 | Schema 精度对齐，SQL 对实际数据库为幂等操作 |
 
+### #15 — 20260228_add_iit_phase2_user_project_rbac
+
+| 属性 | 值 |
+|------|-----|
+| 应用时间 | 2026-02-28 12:17:00 |
+| 影响 Schema | iit_schema, platform_schema |
+| 核心内容 | Phase 2 用户-项目关联 + RBAC：user_mappings 增加 user_id（FK → platform_schema.users），projects 增加 tenant_id（FK → platform_schema.tenants），UserRole 枚举增加 IIT_OPERATOR |
+| 创建方式 | 手动创建 + `prisma migrate resolve --applied`（降级方案） |
+
 ---
 
 ## 3. 迁移创建方式说明
@@ -148,7 +157,7 @@
 |------|---------|---------|
 | `prisma migrate dev` | 标准开发流程 | #1 ~ #9 |
 | `prisma migrate dev --create-only` | 仅生成不执行 | — |
-| 手动创建 + `prisma migrate resolve --applied` | Shadow DB 无法重放时 | #12, #13, #14 |
+| 手动创建 + `prisma migrate resolve --applied` | Shadow DB 无法重放时 | #12, #13, #14, #15 |
 | `prisma db push` (⚠️ 非标准) | 快速原型，不产生迁移记录 | 造成了 drift patch 的必要性 |
 
 ---