Implement Comprehensive Monitoring and Observability

## Overview
Set up complete monitoring stack with Prometheus, Grafana, and distributed tracing for production observability.

## Business Value
Comprehensive monitoring is essential for production operations, debugging, and performance optimization.

## Current State
- Basic health checks exist
- No metrics collection
- No distributed tracing
- No dashboards

## Subtasks
- [ ] Set up Prometheus
- [ ] Add metrics instrumentation
- [ ] Configure Grafana dashboards
- [ ] Implement distributed tracing
- [ ] Add log aggregation
- [ ] Create alerting rules
- [ ] Document monitoring

## Implementation Steps
1. Set up Prometheus
2. Add metrics to code
3. Configure Grafana
4. Add tracing
5. Set up alerts

## Acceptance Criteria
- [ ] Metrics are collected
- [ ] Dashboards are available
- [ ] Tracing works
- [ ] Alerts are configured
- [ ] Documentation exists

## Estimated Effort
- Hours: 24-32
- Complexity: Medium