Fix/security performance hardening#11
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Seguridad: - submissions: transacción Serializable en chequeo de duplicado + puntaje (envíos concurrentes duplicaban puntos); comparación de flags a tiempo constante; validar tipo y longitud de la flag - submissions/files: los retos bloqueados ahora respetan las condiciones de desbloqueo vía helper compartido src/lib/unlock.ts (antes un reto desbloqueado seguía rechazando envíos) - hints: exigir sesión en GET, ventana de juego y saldo del equipo al comprar, compra atómica (la concurrente daba 500), ocultar hints de retos inactivos - auth: bcrypt dummy cuando el alias no existe (enumeración por timing), fallback a x-real-ip, tope de longitud de contraseña (DoS bcrypt) - register: validación de tipos y formato, alias con charset estricto (suplantación con espacios), contraseña 6-128, carrera P2002 → 409 - teams: creación atómica (equipo + líder), guard TOCTOU contra unirse a dos equipos a la vez, validación de tipos - files: sanitizar filename en Content-Disposition (inyección de headers) - middleware: tope al mapa del rate limiter (agotamiento de memoria vía X-Forwarded-For falsificado) - admin: points/costos como enteros no negativos, links solo http(s) (bloquea javascript:), límite de longitud en anuncios, validar fechas - next.config: cabeceras de seguridad y quitar X-Powered-By Rendimiento: - challenges: query agrupada de condiciones de desbloqueo (antes N+1) - leaderboard: contar miembros con _count en vez de cargar las filas - cache: misses concurrentes comparten un solo fetch (anti-stampede)
…n, and hardened CI pipeline security
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