add embedded checkout

.env.example

@@ -16,4 +16,16 @@ SERVER_IP=192.168.1.225
 
 # docker-compose (staging) — host-side deploy config, never baked into the image.
 PORT=3001        # public port to publish (nginx container listens on 3001)
-PB_DATA=./pb_data # where to persist PocketBase data on the host
+PB_DATA=./pb_data # where to persist PocketBase data on the host
+# Stripe subscriptions (server-only). Leave blank for dummy/simulated checkout.
+STRIPE_SECRET_KEY=
+STRIPE_WEBHOOK_SECRET=
+# Price IDs for the monthly/yearly tiers (from the Stripe Dashboard).
+STRIPE_PRICE_MONTHLY=
+STRIPE_PRICE_YEARLY=
+# Client-side publishable key (used by Checkout redirect in the browser).
+PUBLIC_STRIPE_PUBLISHABLE_KEY=
+
+STRIPE_PRICE_TRIAL=
+
+# Dev-only: gate for /account/webhook/simulate. Leave unset in prod.