feat: add Auth.js authentication with email verification and login/register forms

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

prisma/schema.prisma

@@ -60,6 +60,17 @@ model User {
   @@map("users")
 }
 
+model VerificationToken {
+  id         Int      @id @default(autoincrement())
+  identifier String
+  token      String   @unique
+  expires    DateTime
+  createdAt  DateTime @default(now()) @map("created_at")
+
+  @@index([identifier])
+  @@map("verification_tokens")
+}
+
 model Meeting {
   id          Int           @id @default(autoincrement())
   uuid        String        @unique