Allow local registration without early access code

[evadecker]

#352 introduced early access codes to limit production access, but it also removed a check for import.meta.env.PROD.

Problem:
When registering locally, an early access code should not be required.

Fix:
Add a check for import.meta.env.PROD to decide whether to display the early access code requirement. If a user is in a development environment, allow them to register without an early access code.