STORY-008: Create API routes for health check and boom endpoint

[blues-man]

Migration Story

Priority: P2 | Effort: S | Rules: R11, R12

Description

Create Next.js API Route Handlers to replace Express middleware. Health check route for Kubernetes probes. Boom route for degradation simulation.

Acceptance Criteria

• GET /api/health returns 200 OK with status JSON
• GET /api/health/ready returns readiness status
• GET /api/boom toggles degraded state
• Degraded state adds delay to subsequent requests (via middleware.ts)

Files

Created: src/app/api/health/route.ts, src/app/api/boom/route.ts, src/middleware.ts
Removed: middleware/boom.js
Dependencies: STORY-001

[blues-man]

Completed: Migration implemented and verified. Build passes, dev server runs, all endpoints functional.