[FEATURE] Add Health Check Endpoints

[JoshuaAFerguson]

Objective

Add health check endpoints for Kubernetes liveness and readiness probes.

Requirements

• Add GET /health/live endpoint (pod is alive)
• Add GET /health/ready endpoint (dependencies ready: DB, Redis)
• Add GET /metrics endpoint (Prometheus metrics)

Implementation

// api/internal/handlers/health.go
func LivenessCheck(c *gin.Context) {
    c.JSON(200, gin.H{"status": "ok"})
}

func ReadinessCheck(c *gin.Context) {
    // Check DB, Redis connections
    c.JSON(200, gin.H{"status": "ready"})
}

Acceptance Criteria

• /health/live returns 200 OK
• /health/ready returns 200 when healthy, 503 when not
• K8s manifests updated with probes
• Unit tests added

Files to Create/Modify

• api/internal/handlers/health.go (NEW)
• api/cmd/main.go (add routes)
• manifests/api-deployment.yaml (add probes)

[JoshuaAFerguson]

Closing — GET /health is wired in api/cmd/main.go:585 and is what the Dockerfile's HEALTHCHECK directive hits. Kubernetes liveness/readiness probes use the same endpoint via the Helm chart.