Task 10.4: Analytics Service Implementation

[kluth]

Phase: 10 - Showcase Application (Lower Priority)

Tags: feature, showcase, observability

Description:
Implement metrics aggregation, Prometheus exporter, Grafana dashboard JSON, write metrics tests, and document schema.

Acceptance Criteria:

• Implement metrics aggregation
• Implement Prometheus exporter
• Create Grafana dashboard JSON
• Write metrics tests
• Document schema