Auth, Indexer, and Idempotency Implementation

[AbilityTechy]

Pull Request: Auth, Indexer, and Idempotency Implementation

Summary

This PR implements three core features: JWT-based authentication, a smart-contract event indexer, and idempotency guarantees for event processing. Each feature includes comprehensive unit and integration tests.

Key Changes

• JWT Middleware: Secure token validation for protected routes.
• Idempotency: Prevents duplicate event processing using Idempotency-Key.
• Event Indexer: Pipeline for tracking escrow and dispute lifecycle updates.

Related Issues

• Closes [Mike] 05. Authentication middleware #55
• Closes [Mike] 17. Event idempotency guarantees #67
• Closes [Mike] 20. Smart-contract event indexer #70

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