feat: Implement a weekly schedule calendar on the homepage and extend branch management with hall count and phone fields.

prisma/schema.prisma

@@ -19,6 +19,7 @@ model Branch {
   name        String
   address     String?
   phone       String?
+  hallCount   Int?         @default(1)
   createdAt   DateTime     @default(now())
   updatedAt   DateTime     @updatedAt
   classes     DanceClass[]