feat(game): add blackjack game component and routing

frontend/src/app/feature/game/blackjack/blackjack.component.html

@@ -0,0 +1,23 @@
+<app-navbar></app-navbar>
+
+<div class="container mx-auto px-4 py-6 space-y-8">
+  <div class="grid grid-cols-1 lg:grid-cols-4 gap-6">
+    <div class="lg:col-span-3 space-y-6 flex flex-col gap-4">
+      <app-dealer-hand [cards]="dealerCards"></app-dealer-hand>
+      <app-player-hand [cards]="playerCards"></app-player-hand>
+      <app-game-controls
+        (onHit)="onHit()"
+        (onStand)="onStand()"
+        (onLeave)="leaveGame()"
+      ></app-game-controls>
+    </div>
+
+    <div class="lg:col-span-1 space-y-6">
+      <app-game-info
+        [balance]="balance()"
+        [currentBet]="currentBet"
+        (onNewGameClick)="onNewGame()"
+      ></app-game-info>
+    </div>
+  </div>
+</div>