Implement core features and documentation

[Emmy123222]

• Document backend domain model and endpoint boundaries #182: Document backend domain model and endpoint boundaries. (close Document backend domain model and endpoint boundaries #182)
• Add creator perk metadata persistence and validation #177: Add creator perk metadata persistence and validation. (close Add creator perk metadata persistence and validation #177)
• Add transaction activity feed endpoint for creators and fans #184: Add transaction activity feed endpoint for creators and fans. (close Add transaction activity feed endpoint for creators and fans #184)
• Add key ownership read model for faster client lookups #183: Add key ownership read model for faster client lookups. (close Add key ownership read model for faster client lookups #183)

Details:

• Established domain documentation in docs/architecture/
• Updated CreatorProfile schema and services for perksJson
• Implemented Activity module for transaction feeds
• Implemented Ownership module for fast lookups
• Fixed Prisma client linting through type inference

[drips-wave]

@Emmy123222 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits