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e3a5c44d37
Implements a comprehensive client metrics system to track peer connection stages and performance. The system supports multiple backend implementations (OpenTelemetry, VictoriaMetrics, and no-op) and tracks detailed connection stage durations from creation through WireGuard handshake. Key changes: - Add metrics package with pluggable backend implementations - Implement OpenTelemetry metrics backend - Implement VictoriaMetrics metrics backend - Add no-op metrics implementation for disabled state - Track connection stages: creation, semaphore, signaling, connection ready, and WireGuard handshake - Move WireGuard watcher functionality to conn.go - Refactor engine to integrate metrics tracking - Add metrics export endpoint in debug server