NIP-87 Support (Nostr Mint Discoverability)

Supporting @benthecarman's NIP-87 would be a big win for ease of onboarding. I see two ways this could be approached:

Option 1: Discover all mints on a hardcoded list of popular relays

Pros:

• Requires no DB migration
• Simple to implement

Cons:

• Cannot leverage existing web-of-trust by inputting your npub/nsec
• No relay configurability

Option 2: Store npub/nsec to leverage web-of-trust

Pros:

• Can leverage existing web-of-trust
  • Could allow for users to enter their npub if they only want to discover mints, only requiring their nsec if they wish to recommend a mint
• Can load the user's preferred relay list automatically

Cons:

• Requires a DB migration to store an npub/nsec
  • Probably makes sense to use a singleton pattern and store a single npub/nsec
• Complex to implement
  • I believe most of the complexity would be in the UI, whereas the backend just needs to be able to store a single npub/nsec