Add database file size and reorganize status page

- Add database file size tracking to Stats struct and GetStats()
- Move routing table metrics to separate 'Routing Table' status box
- Add IPv4/IPv6 updates per second to routing table metrics
- Database box now shows: ASNs, prefixes, peerings, and database size
- Routing table box shows: live routes, IPv4/IPv6 counts, and update rates

internal/routewatch/cli.go

@@ -6,14 +6,21 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"go.uber.org/fx"
 )
 
+const (
+	// shutdownTimeout is the maximum time allowed for graceful shutdown
+	shutdownTimeout = 60 * time.Second
+)
+
 // CLIEntry is the main entry point for the CLI
 func CLIEntry() {
 	app := fx.New(
 		getModule(),
+		fx.StopTimeout(shutdownTimeout), // Allow 60 seconds for graceful shutdown
 		fx.Invoke(func(lc fx.Lifecycle, rw *RouteWatch, logger *slog.Logger) {
 			lc.Append(fx.Hook{
 				OnStart: func(_ context.Context) error {