feat: add WebSocket-specific Prometheus metrics#374
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WebSocket connections were skewing HTTP latency metrics because their connection duration was being recorded as request duration.
This PR:
/wsfrom Prometheus HTTP metrics (isInternalRoute)/wsfrom OTel tracing and metrics (excludeWebSocketFromOTel)quickpizza_server_ws_connections_active(Gauge)quickpizza_server_ws_connection_duration_seconds(Native Histogram)quickpizza_server_ws_messages_received_total(Counter)quickpizza_server_ws_message_processing_duration_seconds(Native Histogram)