fix: raise maxParamLength to 500 for long filenames

Fastify's find-my-way router defaults maxParamLength to 100 chars.
Files with long names (e.g., stock photo filenames >100 chars) would
return 404 on download because the :filename param exceeded the limit.

apps/api/src/index.ts

@@ -42,6 +42,7 @@ recoverInterruptedInstalls();
 const app = Fastify({
   logger: { level: env.LOG_LEVEL },
   bodyLimit: env.MAX_UPLOAD_SIZE_MB > 0 ? env.MAX_UPLOAD_SIZE_MB * 1024 * 1024 : 1073741824,
+  maxParamLength: 500,
 });
 
 app.setErrorHandler((error: Error & { statusCode?: number }, request, reply) => {