feat(metrics): add comprehensive metrics collection system

Implement real-time stats tracking including connection counts, request metrics, bandwidth usage, and route-specific monitoring. Adds MetricsCollector with observable streams for reactive monitoring integration.

ts/proxies/smart-proxy/models/index.ts

@@ -4,3 +4,4 @@
 // Export everything except IAcmeOptions from interfaces
 export type { ISmartProxyOptions, IConnectionRecord, TSmartProxyCertProvisionObject } from './interfaces.js';
 export * from './route-types.js';
+export * from './metrics-types.js';