fix(api): detect Riot TFT paths without a leading slash

Proxy rest paths are tft/league/... so includes('/tft/') never matched
and the LOL key (missing) was used instead.

server.ts

@@ -26,10 +26,15 @@ const TRACKER_API_BASE = 'https://public-api.tracker.gg';
 function getRiotApiKey(path: string, gameTypeHeader: string | undefined): string {
   const lolKey = process.env['RIOT_API_KEY_LOL'] || '';
   const tftKey = process.env['RIOT_API_KEY_TFT'] || '';
-  if (gameTypeHeader === 'tft' || path.includes('/tft/')) {
-    return tftKey;
+  // rest path is like "tft/league/..." (no leading slash) after the routing region.
+  const isTft =
+    gameTypeHeader === 'tft' ||
+    path.startsWith('tft/') ||
+    path.includes('/tft/');
+  if (isTft) {
+    return tftKey || lolKey;
   }
-  return lolKey;
+  return lolKey || tftKey;
 }
 
 // The Express app is exported so that it can be used by serverless Functions.