add robots txt route, verifiy required env vars func

config/environment.ts

@@ -1,6 +1,33 @@
-export const environment: Environment = {
+import { resolve } from "node:path";
+import { logger } from "@creations.works/logger";
+
+const environment: Environment = {
 	port: Number.parseInt(process.env.PORT || "8080", 10),
 	host: process.env.HOST || "0.0.0.0",
 	development:
 		process.env.NODE_ENV === "development" || process.argv.includes("--dev"),
 };
+
+const robotstxtPath: string | null = process.env.ROBOTS_FILE
+	? resolve(process.env.ROBOTS_FILE)
+	: null;
+
+function verifyRequiredVariables(): void {
+	const requiredVariables = ["HOST", "PORT"];
+
+	let hasError = false;
+
+	for (const key of requiredVariables) {
+		const value = process.env[key];
+		if (value === undefined || value.trim() === "") {
+			logger.error(`Missing or empty environment variable: ${key}`);
+			hasError = true;
+		}
+	}
+
+	if (hasError) {
+		process.exit(1);
+	}
+}
+
+export { environment, robotstxtPath, verifyRequiredVariables };