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/metrics/metrics.go

@@ -15,6 +15,7 @@ type Tracker struct {
 	registry       metrics.Registry
 	connectedSince time.Time
 	isConnected    atomic.Bool
+	reconnectCount atomic.Uint64
 
 	// Stream metrics (decompressed data)
 	messageCounter metrics.Counter
@@ -50,14 +51,23 @@ func New() *Tracker {
 
 // SetConnected updates the connection status
 func (t *Tracker) SetConnected(connected bool) {
-	t.isConnected.Store(connected)
+	wasConnected := t.isConnected.Swap(connected)
 	if connected {
 		t.mu.Lock()
 		t.connectedSince = time.Now()
 		t.mu.Unlock()
+		// Increment reconnect count (but not for the initial connection)
+		if wasConnected || t.reconnectCount.Load() > 0 {
+			t.reconnectCount.Add(1)
+		}
 	}
 }
 
+// GetReconnectCount returns the number of reconnections since startup
+func (t *Tracker) GetReconnectCount() uint64 {
+	return t.reconnectCount.Load()
+}
+
 // IsConnected returns the current connection status
 func (t *Tracker) IsConnected() bool {
 	return t.isConnected.Load()
@@ -110,6 +120,7 @@ func (t *Tracker) GetStreamMetrics() StreamMetrics {
 		MessagesPerSec: t.messageRate.Rate1(),
 		BitsPerSec:     t.byteRate.Rate1() * bitsPerByte,
 		WireBitsPerSec: t.wireByteRate.Rate1() * bitsPerByte,
+		ReconnectCount: t.reconnectCount.Load(),
 	}
 }
 
@@ -149,6 +160,8 @@ type StreamMetrics struct {
 	BitsPerSec float64
 	// WireBitsPerSec is the rate of bits received on the wire per second (1-minute average)
 	WireBitsPerSec float64
+	// ReconnectCount is the number of reconnections since startup
+	ReconnectCount uint64
 }
 
 // RouteMetrics contains route update statistics