Add Mellat e-payment, videos/instructions CMS, and legacy domain lookup.

Store gateway credentials per business, initiate/verify Mellat at checkout, and resolve old CMS ids from domains in the migrate modal.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

@@ -14,6 +14,9 @@ REDIS_URL=redis://localhost:6379
 
 # API
 PORT=3000
+# Public base URL used for bank payment callbacks (no trailing slash)
+# Production: https://api.meshkee.com
+API_PUBLIC_BASE_URL=http://localhost:3000
 
 # JWT
 JWT_ACCESS_SECRET=change-me-access-secret-min-32-chars-long