Add connection duration and reconnect count to status page

- Track reconnection count in metrics tracker
- Display connection duration under Stream Statistics
- Display reconnect count since app startup
- Update both JSON API and HTML status page

internal/server/handlers.go

@@ -330,6 +330,8 @@ func (s *Server) handleStats() http.HandlerFunc {
 		MbitsPerSec            float64                       `json:"mbits_per_sec"`
 		WireMbitsPerSec        float64                       `json:"wire_mbits_per_sec"`
 		Connected              bool                          `json:"connected"`
+		ConnectionDuration     string                        `json:"connection_duration"`
+		ReconnectCount         uint64                        `json:"reconnect_count"`
 		GoVersion              string                        `json:"go_version"`
 		Goroutines             int                           `json:"goroutines"`
 		MemoryUsage            string                        `json:"memory_usage"`
@@ -442,6 +444,12 @@ func (s *Server) handleStats() http.HandlerFunc {
 			whoisStats = s.getWHOISStats(ctx)
 		}
 
+		// Calculate connection duration
+		connectionDuration := "disconnected"
+		if metrics.Connected && !metrics.ConnectedSince.IsZero() {
+			connectionDuration = time.Since(metrics.ConnectedSince).Truncate(time.Second).String()
+		}
+
 		stats := StatsResponse{
 			Uptime:                 uptime,
 			TotalMessages:          metrics.TotalMessages,
@@ -451,6 +459,8 @@ func (s *Server) handleStats() http.HandlerFunc {
 			MbitsPerSec:            metrics.BitsPerSec / bitsPerMegabit,
 			WireMbitsPerSec:        metrics.WireBitsPerSec / bitsPerMegabit,
 			Connected:              metrics.Connected,
+			ConnectionDuration:     connectionDuration,
+			ReconnectCount:         metrics.ReconnectCount,
 			GoVersion:              runtime.Version(),
 			Goroutines:             runtime.NumGoroutine(),
 			MemoryUsage:            humanize.Bytes(memStats.Alloc),