Refactor chat and market modules for improved integration and maintainability

- Remove deprecated Nostr chat and relay hub components, transitioning to a modular chat service for better encapsulation.
- Update App.vue and Navbar.vue to utilize the new chat module, enhancing user experience with automatic peer management.
- Simplify event handling and connection logic in ChatComponent.vue, ensuring compatibility with the new chat service architecture.
- Adjust market settings and order history components to reflect changes in the chat module, improving overall coherence in the application structure.
- Clean up unused imports and streamline configuration access for better performance and maintainability.

src/components/layout/Navbar.vue

@@ -15,7 +15,7 @@ import { LogoutConfirmDialog } from '@/components/ui/LogoutConfirmDialog'
 import { auth } from '@/composables/useAuth'
 import { useMarketPreloader } from '@/composables/useMarketPreloader'
 import { useMarketStore } from '@/stores/market'
-import { nostrChat } from '@/composables/useNostrChat'
+import { tryInjectService, SERVICE_TOKENS } from '@/core/di-container'
 import { useModularNavigation } from '@/composables/useModularNavigation'
 
 interface NavigationItem {
@@ -45,9 +45,12 @@ const totalBalance = computed(() => {
   }, 0)
 })
 
+// Try to get chat service from DI (may not be available if chat module not loaded)
+const chatService = tryInjectService(SERVICE_TOKENS.CHAT_SERVICE)
+
 // Compute total unread messages (reactive)
 const totalUnreadMessages = computed(() => {
-  return nostrChat.totalUnreadCount.value
+  return chatService?.totalUnreadCount?.value || 0
 })
 
 // Compute cart item count