Express to Fastify Migration

MANDATORY WORKFLOW

You MUST complete each phase IN ORDER. Do NOT proceed to the next phase until the current phase is complete. Report your progress after each phase.

Phase 1: Assessment & Baseline Capture (REQUIRED before any code changes)

Before writing ANY code, you MUST:

1.1 Document the existing codebase:

1. Routes: List ALL Express routes in the codebase (method, path, handler)
2. Middleware: List ALL middleware (global and route-specific)
3. Dependencies: List ALL Express-related dependencies from package.json
4. Custom patterns: Note any authentication, error handling, or custom middleware

1.2 Capture Express API responses (CRITICAL):