feat(complement-race): add infinite win condition for Steam Sprint mode

PROBLEM:
After a few routes in Steam Sprint mode, the "victory!" page was appearing.
Steam Sprint is designed to be an infinite game that never ends.

ROOT CAUSE:
The default config had:
  winCondition: 'route-based'
  routeCount: 3

So after completing 3 routes, the validator's checkWinCondition method would
find a winner and trigger the results/victory screen (line 835 in Validator).

FIX:
1. Added 'infinite' as a new valid winCondition type (game-configs.ts:92)
2. Updated default config to use winCondition: 'infinite' (both in
   arcade-games/complement-race/index.tsx and lib/arcade/game-configs.ts)
3. Updated checkWinCondition to return null immediately when winCondition === 'infinite'
   (Validator.ts:815-818)

BEHAVIOR:
- Steam Sprint now runs indefinitely with infinite routes
- Train automatically advances to next route after completing each one
- Game never ends unless player manually quits or leaves room
- Score and deliveries continue to accumulate across all routes
- Other win conditions (route-based, score-based, time-based) still work for
  custom game modes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/arcade-games/complement-race/Validator.ts

@@ -812,6 +812,11 @@ export class ComplementRaceValidator
   private checkWinCondition(state: ComplementRaceState): string | null {
     const { config, players } = state
 
+    // Infinite mode: Never end the game
+    if (config.winCondition === 'infinite') {
+      return null
+    }
+
     // Practice mode: First to reach goal
     if (config.style === 'practice') {
       for (const [playerId, player] of Object.entries(players)) {

apps/web/src/arcade-games/complement-race/index.tsx

@@ -41,7 +41,7 @@ const defaultConfig: ComplementRaceConfig = {
   passengerCount: 6,
   maxConcurrentPassengers: 3,
   raceGoal: 20,
-  winCondition: 'route-based',
+  winCondition: 'infinite', // Sprint mode is infinite by default (Steam Sprint)
   routeCount: 3,
   targetScore: 100,
   timeLimit: 300,

apps/web/src/lib/arcade/game-configs.ts

@@ -89,7 +89,7 @@ export interface ComplementRaceGameConfig {
   raceGoal: number // questions to win practice mode (default 20)
 
   // Win Conditions
-  winCondition: 'route-based' | 'score-based' | 'time-based'
+  winCondition: 'route-based' | 'score-based' | 'time-based' | 'infinite'
   targetScore?: number // for score-based (e.g., 100)
   timeLimit?: number // for time-based (e.g., 300 seconds)
   routeCount?: number // for route-based (e.g., 3 routes)
@@ -171,7 +171,7 @@ export const DEFAULT_COMPLEMENT_RACE_CONFIG: ComplementRaceGameConfig = {
   raceGoal: 20,
 
   // Win conditions
-  winCondition: 'route-based',
+  winCondition: 'infinite', // Sprint mode is infinite by default (Steam Sprint)
   routeCount: 3,
   targetScore: 100,
   timeLimit: 300,