feat: member portal Sprint 2 — digest history page and restore Digest/DigestConfig schema models

- Restore Digest + DigestConfig models to schema.prisma (wiped by prior git reset)
- Add Tenant.digestConfig / Tenant.digests relations
- GET /my/digest API endpoint (last 20 digests, truncated summary)
- BFF route /api/my/digest
- /my/digest page: digest cards with date, message count, summary preview
- Add Digest nav item to MemberShell sidebar

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/prisma/schema.prisma

@@ -88,6 +88,8 @@ model Tenant {
   auditEvents    AuditEvent[]
   rules          TenantRule[]
   groupAccesses  GroupAccess[]
+  digestConfig   DigestConfig?
+  digests        Digest[]
 }
 
 enum AdminRole {
@@ -495,3 +497,34 @@ model TenantRule {
   @@index([tenantId, isActive])
   @@index([tenantId, matchType])
 }
+
+// ============================================================================
+// Digest
+// ============================================================================
+
+model DigestConfig {
+  id              String   @id @default(cuid())
+  tenantId        String   @unique
+  tenant          Tenant   @relation(fields: [tenantId], references: [id])
+  targetGroupJid  String
+  targetAccountId String
+  scheduleHour    Int      @default(20)
+  scheduleMinute  Int      @default(0)
+  isActive        Boolean  @default(true)
+  lastSentAt      DateTime?
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+}
+
+model Digest {
+  id         String   @id @default(cuid())
+  tenantId   String
+  tenant     Tenant   @relation(fields: [tenantId], references: [id])
+  content    String
+  messageIds String[]
+  digestDate DateTime
+  sentAt     DateTime @default(now())
+
+  @@unique([tenantId, digestDate])
+  @@index([tenantId])
+}

apps/api/src/modules/my/my.controller.ts

@@ -29,6 +29,11 @@ export class MyController {
     return this.service.getDashboard(member.sub, member.tenantId);
   }
 
+  @Get('digest')
+  digests(@CurrentMember() member: MemberJwtPayload) {
+    return this.service.getDigests(member.tenantId);
+  }
+
   @Get('profile')
   profile(@CurrentMember() member: MemberJwtPayload) {
     return this.service.getProfile(member.sub, member.tenantId);

apps/api/src/modules/my/my.service.ts

@@ -26,6 +26,22 @@ export class MyService {
     };
   }
 
+  async getDigests(tenantId: string) {
+    const digests = await this.prisma.digest.findMany({
+      where: { tenantId },
+      orderBy: { digestDate: 'desc' },
+      take: 20,
+      select: { id: true, digestDate: true, content: true, messageIds: true, sentAt: true },
+    });
+    return digests.map((d) => ({
+      id: d.id,
+      digestDate: d.digestDate.toISOString(),
+      summary: d.content.slice(0, 300),
+      messageCount: (d.messageIds as string[]).length,
+      sentAt: d.sentAt.toISOString(),
+    }));
+  }
+
   async getDashboard(userId: string, tenantId: string) {
     const user = await this.prisma.towerUser.findFirst({ where: { id: userId, tenantId } });
     if (!user) throw new NotFoundException('User not found');