feat: separate xp and score rewards

[kiel997]

closes #617

Summary

Separates XP, score, and blockchain reward responsibilities in the Mind Block backend.

Changes

• Added ScoreService for independent score calculation.
• Added RewardService for independent reward eligibility calculation.
• Reused the existing XpLevelService for player progression.
• Updated progress calculation to use ScoreService.
• Removed direct XP/level mutation from the progress calculation flow.
• Routed daily quest bonus XP through XpLevelService.
• Kept blockchain interaction isolated from score and reward eligibility calculations.
• Added unit tests for score calculation.
• Added unit tests for reward eligibility.

Architecture

Correct Answer
↓
Score
↓
XP
↓
Reward Eligibility
↓
Blockchain Reward

Testing

• npm test -- --runInBand
• All existing tests pass.
• ScoreService tests pass.
• RewardService tests pass.

Acceptance Criteria

• XP is calculated independently.
• Score is calculated independently.
• Reward eligibility is calculated independently.
• Blockchain interaction is isolated behind a service.
• Puzzle validation does not directly depend on blockchain availability.
• Tests exist for score and reward calculations.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
mind-block-app-frontend	Skipped		Aug 20, 2026 2:16am