优化日志切分和保留策略

apps/backend/src/config/env-overrides.ts

@@ -31,6 +31,7 @@ export const ENV_OVERRIDES: readonly EnvOverride[] = [
   integerEnv("PORT", ["server", "port"]),
   stringEnv("DATA_ROOT", ["data", "root"], path.resolve),
   stringEnv("LOG_LEVEL", ["logging", "level"]),
+  integerEnv("LOG_RETENTION_DAYS", ["logging", "retentionDays"]),
   stringEnv("DATABASE_URL", ["database", "url"]),
   booleanEnv("DATABASE_SSL", ["database", "ssl"]),
   integerEnv("DATABASE_MAX_CONNECTIONS", ["database", "maxConnections"]),