Refactor: Move account age checks to rules folder
This commit moves the account age related checks into the
`rules/account` folder, organizing the project structure.
feat: Add Prettier config and plugins
feat: Add ESLint config and plugins
fix: Fix missing import for Agent
feat: Implement metrics endpoint
refactor: Improve test organization
fix: Mock fetch in age.test.ts
fix: Add tests for countStarterPacks
refactor: Move account age checks to rules folder
feat: Add tests for facet spam detection