fix(api): add JWT scheme to @ApiBearerAuth and fix Prisma 7 extensions config

- Add 'JWT' scheme name to @ApiBearerAuth() in payments & subscriptions
  controllers so Swagger UI correctly links to the JWT security definition
- Add postgresqlExtensions preview feature to Prisma schema for v7 compat

Co-Authored-By: Paperclip <noreply@paperclip.ing>

prisma/schema.prisma

@@ -10,7 +10,6 @@ generator client {
 
 datasource db {
   provider   = "postgresql"
-  url        = env("DATABASE_URL")
   extensions = [postgis]
 }