Implement Specials feature, Admin UI enhancements, and Database Rebuild tool

prisma/schema.prisma

@@ -19,6 +19,7 @@ model Song {
   createdAt DateTime @default(now())
   puzzles   DailyPuzzle[]
   genres    Genre[]
+  specials  Special[]
 }
 
 model Genre {
@@ -28,6 +29,16 @@ model Genre {
   dailyPuzzles DailyPuzzle[]
 }
 
+model Special {
+  id          Int      @id @default(autoincrement())
+  name        String   @unique
+  maxAttempts Int      @default(7)
+  unlockSteps String   // JSON array: "[2,4,7,11,16,30,60]"
+  createdAt   DateTime @default(now())
+  songs       Song[]
+  dailyPuzzles DailyPuzzle[]
+}
+
 model DailyPuzzle {
   id        Int      @id @default(autoincrement())
   date      String   // Format: YYYY-MM-DD
@@ -35,6 +46,8 @@ model DailyPuzzle {
   song      Song     @relation(fields: [songId], references: [id])
   genreId   Int?
   genre     Genre?   @relation(fields: [genreId], references: [id])
+  specialId Int?
+  special   Special? @relation(fields: [specialId], references: [id])
 
-  @@unique([date, genreId]) // Unique puzzle per date per genre (null genreId = global puzzle)
+  @@unique([date, genreId, specialId])
 }