feat: implement attestation and usage read endpoints with row-level authorization

[ayo-ola0710]

What this changes

I introduced the core read API endpoints (/v1/attestations and /v1/usage) required to serve dashboard exports and verification flows. To support these endpoints, we configured Prisma ORM using a local SQLite adapter and defined schemas for both attestations and usage. The service layer logic is now firmly secured with strict row-level authorization—ensuring callers can only fetch data scoped to their tenant identity—and includes stable cursor pagination designed to handle continuously growing datasets without skipping rows. Finally, we tied this together with comprehensive Zod query validation, added robust integration tests to prevent cross-tenant data leaks, and updated our .gitignore to prevent committing local development databases.

Close #56

Why

How it was verified

• [. ] Existing tests pass
• [ .] New tests cover the change
• No change to a public contract interface, or a migration note is included

Risk

[joelpeace48-cell]

@ayo-ola0710, Ci fails, ensure all ci passes and also resolve conflicts

[ayo-ola0710]

@joelpeace48-cell

Pls review again