feat: add hedge fund management features including creation, deletion, and manager assignments

prisma/schema.prisma

@@ -19,9 +19,37 @@ model User {
   createdAt       DateTime        @default(now())
   updatedAt       DateTime        @updatedAt
 
+  isFund         Boolean       @default(false)
+
   positions      Position[]
   trades         Trade[]
   passwordResets PasswordReset[]
+  managedFunds   FundManager[]
+  fund           HedgeFund?
+}
+
+model HedgeFund {
+  id        String        @id @default(cuid())
+  name      String        @unique
+  slug      String        @unique  // lowercase, URL-safe
+  userId    String        @unique  // shadow User account that holds positions/trades/balance
+  user      User          @relation(fields: [userId], references: [id])
+  createdAt DateTime      @default(now())
+
+  managers  FundManager[]
+
+  @@index([slug])
+}
+
+model FundManager {
+  id      String    @id @default(cuid())
+  fundId  String
+  fund    HedgeFund @relation(fields: [fundId], references: [id], onDelete: Cascade)
+  userId  String
+  user    User      @relation(fields: [userId], references: [id], onDelete: Cascade)
+  addedAt DateTime  @default(now())
+
+  @@unique([fundId, userId])
 }
 
 model PasswordReset {