feat(helm): Add observability support with ServiceMonitor and Grafana dashboard
Add comprehensive observability configuration to Helm chart:
**Helm Values:**
- Add observability configuration section for metrics, tracing, and logging
- Add serviceMonitor configuration (disabled by default)
- Add prometheusRule configuration (disabled by default)
**Templates:**
- Update deployment to include observability environment variables
- Update deployment to expose metrics port (9090)
- Update service to expose metrics port
- Add ServiceMonitor template for Prometheus Operator
- Add PrometheusRule template with critical and warning alerts
**Dashboards:**
- Add comprehensive Grafana dashboard JSON with 6 panels:
- Request Rate (by method and endpoint)
- Error Rate (5xx errors percentage)
- Request Latency (P50/P95 by endpoint)
- Top MCP Tools (by invocation volume)
- Nextcloud API Latency (by app)
- Vector Sync Queue Size
- Add dashboard README with import instructions
**Alert Rules:**
- Critical: Server down, high error rate (>5%), high latency (>1s), dependency down
- Warning: Token validation errors (>1%), vector sync queue high (>100), Qdrant slow (>500ms)
All features are opt-in via values.yaml configuration.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
