feat: Enhance RelayHub component with subscription count details (still not working)

- Update RelayHubStatus.vue to display both local and global subscription counts, improving user visibility into active subscriptions.
- Add totalSubscriptionCount computed property in useRelayHub.ts to track the total number of subscriptions.
- Implement totalSubscriptionCount getter in relayHub.ts to return the size of the subscriptions map.
- Include debug logging in relayHub.ts for connected relay counts and statuses to aid in troubleshooting.

src/composables/useRelayHub.ts

@@ -13,6 +13,7 @@ export function useRelayHub() {
   // Computed properties
   const connectedRelayCount = computed(() => relayHub.connectedRelayCount)
   const totalRelayCount = computed(() => relayHub.totalRelayCount)
+  const totalSubscriptionCount = computed(() => relayHub.totalSubscriptionCount)
   const connectionHealth = computed(() => {
     if (totalRelayCount.value === 0) return 0
     return (connectedRelayCount.value / totalRelayCount.value) * 100
@@ -250,6 +251,7 @@ export function useRelayHub() {
     // Computed
     connectedRelayCount,
     totalRelayCount,
+    totalSubscriptionCount,
     connectionHealth,
     
     // Methods