feat(admin): add admin panel with user management, daily puzzle CRUD, and activity graph

- Add admin page at /admin (restricted to ADMIN_EMAIL via proxy)
- Implement user ban/unban and deletion
- Add daily puzzle creation, modification, deletion
- Include 14-day activity chart with hover details
- Add User.banned field to schema and migrate database
- Block banned users from logging in
- Add ADMIN_EMAIL to .env.local configuration
- Update Prisma client after schema changes

app/components/ScreenRouter.tsx

@@ -67,8 +67,6 @@ export function ScreenRouter({
       <HomeScreen
         playerName={playerName} setPlayerName={setPlayerName}
         joinCode={joinCode} setJoinCode={setJoinCode}
-        maxPlayers={maxPlayers} setMaxPlayers={setMaxPlayers}
-        totalRounds={totalRounds} setTotalRounds={setTotalRounds}
         error={error} setError={setError} loading={loading}
         onCreateRoom={handlers.handleCreateRoom}
         onJoinRoom={handlers.handleJoinRoom}
@@ -108,6 +106,8 @@ export function ScreenRouter({
       onLeave={handlers.handleLeave}
       onStart={handlers.handleStartGame}
       onReset={handlers.handleResetGame}
+      maxPlayers={maxPlayers} setMaxPlayers={setMaxPlayers}
+      totalRounds={totalRounds} setTotalRounds={setTotalRounds}
     />
   );