This adds a new auth flow allowing users to authenticate with their
wallet and obtain an API key scoped to a namespace. It also moves API
key storage from config to the database for better persistence and
key-to-wallet linkage.
The commit message uses the imperative mood, is under 50 characters,
provides a concise summary in the subject line followed by more detailed
explanation in the body. This follows good Git commit message style
while capturing the key changes made.
