feat(deploy): harden production proxy and cron configuration

lib/env.ts

@@ -3,6 +3,18 @@ const requiredEnvs = [
   "NEXT_PUBLIC_SUPABASE_ANON_KEY",
 ] as const;
 
+const configuredAppUrl = process.env.NEXT_PUBLIC_APP_URL?.trim();
+
+function getAppOrigin() {
+  if (!configuredAppUrl) return "http://localhost:3000";
+
+  try {
+    return new URL(configuredAppUrl).origin;
+  } catch {
+    return "http://localhost:3000";
+  }
+}
+
 for (const key of requiredEnvs) {
   if (!process.env[key]) {
     // Keep as runtime warning for smoother local setup.
@@ -12,9 +24,12 @@ for (const key of requiredEnvs) {
 }
 
 export const env = {
-  appUrl: process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000",
+  appUrl: configuredAppUrl ?? "http://localhost:3000",
+  appOrigin: getAppOrigin(),
   jobSecret: process.env.JOB_SECRET ?? "",
   cronSecret: process.env.CRON_SECRET ?? "",
+  cronSharedSecret:
+    process.env.CRON_SHARED_SECRET ?? process.env.CRON_SECRET ?? "",
   encryptionKey: process.env.ENCRYPTION_KEY ?? "",
   pleskCredEncKey: process.env.PLESK_CRED_ENC_KEY ?? "",
   stripeSecretKey: process.env.STRIPE_SECRET_KEY ?? "",