feat: implement user reporting system with dedicated module, service, controller, DTOs, and Prisma schema updates.

prisma/schema.prisma

@@ -156,6 +156,10 @@ model User {
   subscriptions     AgentSubscription[]
   payments          Payment[]
 
+  // Reports
+  reportsSubmitted  UserReport[] @relation("ReportsSubmitted")
+  reportsReceived   UserReport[] @relation("ReportsReceived")
+
   @@index([email])
   @@index([role])
   @@index([status])
@@ -702,3 +706,34 @@ model Payment {
   @@index([status])
   @@map("payments")
 }
+
+// ============================================
+// USER REPORTS
+// ============================================
+enum ReportStatus {
+  PENDING
+  REVIEWED
+  RESOLVED
+  DISMISSED
+}
+
+model UserReport {
+  id              String       @id @default(uuid())
+  reporterId      String
+  reportedUserId  String
+  conversationId  String?
+  reason          String
+  description     String?
+  status          ReportStatus @default(PENDING)
+  adminNotes      String?
+  createdAt       DateTime     @default(now())
+  updatedAt       DateTime     @updatedAt
+
+  reporter        User         @relation("ReportsSubmitted", fields: [reporterId], references: [id], onDelete: Cascade)
+  reportedUser    User         @relation("ReportsReceived", fields: [reportedUserId], references: [id], onDelete: Cascade)
+
+  @@index([reporterId])
+  @@index([reportedUserId])
+  @@index([status])
+  @@map("user_reports")
+}