Feat/credit apis

[blueogin]

Description

Adds the GoodDollar AntSeed Worker API surface for widget and integration clients: account credit/dashboard endpoints, G$ <-> credit quotes, Celo event ingestion with Base funding, buyer operator consent, principal withdraw, and daily stream accrual.

About #7 (link your issue here)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist:

• PR title matches follow: (Feature|Bug|Chore) Task Name
• My code follows the style guidelines of this project
• I have followed all the instructions described in the initial task (check Definitions of Done)
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have added reference to a related issue in the repository
• I have added a detailed description of the changes proposed in the pull request. I am as descriptive as possible, assisting reviewers as much as possible.
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