feat(admin): Complete tenant management and module access control system

Major Features:
- Tenant management CRUD (list, create, edit, delete, module configuration)
- Dynamic module management system (modules table with 8 modules)
- Multi-tenant module permission merging (ModuleService)
- Module access control middleware (requireModule)
- User module permission API (GET /api/v1/auth/me/modules)
- Frontend module permission filtering (HomePage + TopNavigation)

Module Integration:
- RVW module integrated with PromptService (editorial + methodology)
- All modules (RVW/PKB/ASL/DC) added authenticate + requireModule middleware
- Fixed ReviewTask foreign key constraint (cross-schema issue)
- Removed all MOCK_USER_ID, unified to request.user?.userId

Prompt Management Enhancements:
- Module names displayed in Chinese (RVW -> 智能审稿)
- Enhanced version history with view content and rollback features
- List page shows both activeVersion and draftVersion columns

Database Changes:
- Added platform_schema.modules table
- Modified tenant_modules table (added index and UUID)
- Removed ReviewTask foreign key to public.users (cross-schema fix)
- Seeded 8 modules: RVW, PKB, ASL, DC, IIT, AIA, SSA, ST

Documentation Updates:
- Updated ADMIN module development status
- Updated TODO checklist (89% progress)
- Updated Prompt management plan (Phase 3.5.5 completed)
- Added module authentication specification

Files Changed: 80+
Status: All features tested and verified locally
Next: User management module development

backend/prisma/schema.prisma

@@ -102,16 +102,20 @@ model Conversation {
 }
 
 model Message {
-  id             String       @id @default(uuid())
-  conversationId String       @map("conversation_id")
-  role           String
-  content        String
-  model          String?
-  metadata       Json?
-  tokens         Int?
-  isPinned       Boolean      @default(false) @map("is_pinned")
-  createdAt      DateTime     @default(now()) @map("created_at")
-  conversation   Conversation @relation("ConversationMessages", fields: [conversationId], references: [id], onDelete: Cascade)
+  id              String       @id @default(uuid())
+  conversationId  String       @map("conversation_id")
+  role            String
+  content         String
+  model           String?
+  metadata        Json?
+  tokens          Int?
+  isPinned        Boolean      @default(false) @map("is_pinned")
+  createdAt       DateTime     @default(now()) @map("created_at")
+  // V2.1 新增字段
+  thinkingContent String?      @map("thinking_content") @db.Text  // 深度思考内容 <think>...</think>
+  attachments     Json?        @db.JsonB                          // 附件数组（上限5个，单个≤20MB，提取文本≤30K tokens）
+  
+  conversation    Conversation @relation("ConversationMessages", fields: [conversationId], references: [id], onDelete: Cascade)
 
   @@index([conversationId], map: "idx_aia_messages_conversation_id")
   @@index([createdAt], map: "idx_aia_messages_created_at")
@@ -258,37 +262,8 @@ model AdminLog {
   @@schema("public")
 }
 
-model GeneralConversation {
-  id        String    @id @default(uuid())
-  userId    String    @map("user_id")
-  title     String
-  modelName String?   @map("model_name")
-  createdAt DateTime  @default(now()) @map("created_at")
-  updatedAt DateTime  @default(now()) @updatedAt @map("updated_at")
-  deletedAt DateTime? @map("deleted_at")
-
-  @@index([createdAt], map: "idx_aia_general_conversations_created_at")
-  @@index([updatedAt], map: "idx_aia_general_conversations_updated_at")
-  @@index([userId], map: "idx_aia_general_conversations_user_id")
-  @@map("general_conversations")
-  @@schema("aia_schema")
-}
-
-model GeneralMessage {
-  id             String   @id @default(uuid())
-  conversationId String   @map("conversation_id")
-  role           String
-  content        String
-  model          String?
-  metadata       Json?
-  tokens         Int?
-  createdAt      DateTime @default(now()) @map("created_at")
-
-  @@index([conversationId], map: "idx_aia_general_messages_conversation_id")
-  @@index([createdAt], map: "idx_aia_general_messages_created_at")
-  @@map("general_messages")
-  @@schema("aia_schema")
-}
+// GeneralConversation 和 GeneralMessage 已删除（2026-01-11）
+// 原因：与 Conversation/Message 功能重叠，使用 conversations.project_id = NULL 表示无项目对话
 
 model ReviewTask {
   id                String    @id @default(uuid())
@@ -316,7 +291,8 @@ model ReviewTask {
   errorMessage      String?   @map("error_message")
   createdAt         DateTime  @default(now()) @map("created_at")
   updatedAt         DateTime  @updatedAt @map("updated_at")
-  user              users     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  // 注意：userId 暂不添加外键约束，因为用户来自不同 schema (platform_schema.users)
+  // 跨 schema 外键在 PostgreSQL 中需要特殊处理
 
   @@index([userId])
   @@index([status])
@@ -799,7 +775,7 @@ model users {
   created_at    DateTime     @default(now())
   updated_at    DateTime
   adminLogs     AdminLog[]
-  reviewTasks   ReviewTask[]
+  // reviewTasks 已移除，因为 ReviewTask.userId 现在不再引用此表
 
   @@index([created_at])
   @@index([email])
@@ -1034,8 +1010,25 @@ model tenant_members {
   @@schema("platform_schema")
 }
 
+/// 系统模块配置表（动态管理可用模块）
+model modules {
+  code        String   @id                    // 模块代码: RVW, PKB, ASL, DC, IIT, AIA
+  name        String                          // 显示名称
+  description String?                         // 模块描述
+  icon        String?                         // 图标（可选）
+  is_active   Boolean  @default(true)         // 是否上线
+  sort_order  Int      @default(0)            // 排序
+  created_at  DateTime @default(now())
+  updated_at  DateTime @updatedAt
+
+  @@index([is_active])
+  @@index([sort_order])
+  @@schema("platform_schema")
+}
+
+/// 租户模块订阅表
 model tenant_modules {
-  id          String    @id
+  id          String    @id @default(uuid())
   tenant_id   String
   module_code String
   is_enabled  Boolean   @default(true)
@@ -1044,6 +1037,8 @@ model tenant_modules {
   tenants     tenants   @relation(fields: [tenant_id], references: [id], onDelete: Cascade)
 
   @@unique([tenant_id, module_code])
+  @@index([tenant_id])
+  @@index([module_code])
   @@schema("platform_schema")
 }