Document and test packages endpoints

[TangoYankee]

Description

Write OpenAPI documentation, generate zod, and write end to end tests for packages endpoints

• packages.controller.ts
  • getPackage
  • [ ] documentation
  • [ ] zod generation
  • [ ] e2e tests
  • patchPackage
  • [ ] documentation
  • [ ] zod generation
  • [ ] e2e tests
  • generatePaymentLink
  • [ ] documentation
  • [ ] zod generation
  • [ ] e2e tests