ed25519 verify

[petersalomonsen]

This PR implements the contract part of the flow shown in the diagram below, and includes an e2e test for deposit of fungible tokens to cover the cost of an AI conversation, and signing the refund of what was not spent.

What is important here is the addition of ed25519_verify to be able to verify messages signed by the AI service. The user can request refund of unspent fungible tokens, but in order to do that a signed message from the AI service must be presented.

The actual AI service is being implemented in here: petersalomonsen/near-openai#11

sequenceDiagram
    participant User
    participant Contract
    participant AIService

    User->>Contract: call_js_func(start_ai_conversation)
    Contract->>Contract: Generate conversation_id
    Contract->>Contract: ft_transfer_internal(user, AIService, amount)
    Contract->>User: Return conversation_id

    User->>AIService: Initiate AI request with conversation_id
    AIService->>Contract: Check deposit for conversation_id
    Contract->>AIService: Confirm deposited tokens

    AIService->>User: Provide AI-generated content
    AIService->>AIService: Track spent AI tokens
    AIService->>User: Sign message with unspent tokens

    User->>Contract: call_js_func(refund_unspent, {signature, refund_message})
    Contract->>Contract: Verify signature
    Contract->>Contract: Process refund

    Contract->>User: Return unspent tokens

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[petersalomonsen]

@race-of-sloths include

[race-of-sloths]

@petersalomonsen Thank you for your contribution! Your pull request is now a part of the Race of Sloths!

Current status: waiting for finalization

The pull request is merged, you have 24 hours to finalize your scoring. The scoring ends Sun Oct 20 21:39:43 2024

Reviewer	Score
@Tguntenaar	8

Your contribution is much appreciated with a final score of 8!
You have received 80 Sloth points for this contribution

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[Tguntenaar]

@race-of-sloths score 8