fix(installer): warn when DEFAULTS_MODE is set to an unrecognized value (RE-6)

Previously, setting DEFAULTS_MODE=1 (or any value other than "dev") silently
fell through to prod defaults — HTTPS-only, auth required — with no feedback.
Now emits a yellow warning to stderr and the log before continuing so users
know why dev mode was not applied.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kriszyp

utility/install/installer.ts

@@ -527,6 +527,12 @@ async function createConfigFile(installParams) {
 			if (args[cfg.toLowerCase()] === undefined) args[cfg] = DEV_MODE_CONFIG[cfg];
 		}
 	} else {
+		const defaultsMode = installParams[hdbTerms.INSTALL_PROMPTS.DEFAULTS_MODE];
+		if (defaultsMode !== undefined && defaultsMode !== 'prod') {
+			const warn = `DEFAULTS_MODE value "${defaultsMode}" is not recognized (expected "dev" or "prod"). Using prod defaults.`;
+			console.error(chalk.yellow.bold(`Warning: ${warn}`));
+			hdbLogger.warn(warn);
+		}
 		if (args[CONFIG_PARAMS.OPERATIONSAPI_NETWORK_PORT.toLowerCase()])
 			args[CONFIG_PARAMS.OPERATIONSAPI_NETWORK_SECUREPORT] = null;
 		if (args[CONFIG_PARAMS.HTTP_PORT.toLowerCase()]) args[CONFIG_PARAMS.HTTP_SECUREPORT] = null;