feat: implement lottery win feature and update related components

prisma/schema.prisma

@@ -105,13 +105,13 @@ model Trade {
   id        String    @id @default(cuid())
   userId    String
   user      User      @relation(fields: [userId], references: [id], onDelete: Cascade)
-  hashtagId String
-  hashtag   Hashtag   @relation(fields: [hashtagId], references: [id])
+  hashtagId String?
+  hashtag   Hashtag?  @relation(fields: [hashtagId], references: [id])
   type      TradeType
   shares    Float
-  price     Float     // price per share at time of trade
+  price     Float     // price per share at time of trade (or win amount for LOTTERY_WIN)
   total     Float     // cost/proceeds of the trade
-  profit    Float     @default(0) // realized P&L (for SELL trades)
+  profit    Float     @default(0) // realized P&L (for SELL trades and LOTTERY_WIN)
   createdAt DateTime  @default(now())
 
   @@index([userId])
@@ -129,4 +129,5 @@ enum TradeType {
   SELL_LONG
   BUY_SHORT
   SELL_SHORT
+  LOTTERY_WIN
 }