feat: Add balance for newly registered user

[dennis531]

Summary

Add configuration REGISTRATION_BALANCE to grant new users a default balance at registration. Simplifies the implementation of a balance-accruing system.

Related #2687

Change Type

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• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Testing

Please describe your test process and include instructions so that we can reproduce your test. If there are any important variables for your testing configuration, list them here.

Test Configuration:

Checklist

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• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules.
• A pull request for updating the documentation has been submitted.

[noobskies]

Does this work for SSO accounts? google, discord etc

[dennis531]

Does this work for SSO accounts? google, discord etc

Yes, because the createUser method is called in the createSocialUser method if the configuration ALLOW_SOCIAL_REGISTRATION is enabled, see

LibreChat/api/strategies/process.js

Line 81 in ee673d6

const newUserId = await createUser(update);

.

[xixingya]

This PR is very useful to me

[danny-avila]

Thanks, I merged #4486 which is the same