feat: Add fallback default for stripePriceId in seed data.

prisma/seed.ts

@@ -1542,7 +1542,7 @@ async function main() {
     {
       name: 'Professional Annual',
       description: 'Full access to all agent features',
-      stripePriceId: process.env.STRIPE_PRICE_ID,
+      stripePriceId: process.env.STRIPE_PRICE_ID || 'price_not_configured',
       amount: 49900,
       currency: 'usd',
       interval: 'year',