Implement modular architecture with core services and Nostr integration

- Introduce a modular application structure with a new app configuration file to manage module settings and features.
- Implement a dependency injection container for service management across modules.
- Create a plugin manager to handle module registration, installation, and lifecycle management.
- Develop a global event bus for inter-module communication, enhancing loose coupling between components.
- Add core modules including base functionalities, Nostr feed, and PWA services, with support for dynamic loading and configuration.
- Establish a Nostr client hub for managing WebSocket connections and event handling.
- Enhance user experience with a responsive Nostr feed component, integrating admin announcements and community posts.
- Refactor existing components to align with the new modular architecture, improving maintainability and scalability.

src/modules/base/pwa/pwa-service.ts

@@ -0,0 +1,45 @@
+// PWA service for base module
+export class PWAService {
+  private deferredPrompt: any = null
+  
+  async initialize(): Promise<void> {
+    console.log('📱 Initializing PWA service...')
+    
+    // Listen for beforeinstallprompt event
+    window.addEventListener('beforeinstallprompt', (e) => {
+      console.log('PWA install prompt available')
+      e.preventDefault()
+      this.deferredPrompt = e
+    })
+    
+    // Listen for app installed event
+    window.addEventListener('appinstalled', () => {
+      console.log('PWA was installed')
+      this.deferredPrompt = null
+    })
+  }
+  
+  canInstall(): boolean {
+    return this.deferredPrompt !== null
+  }
+  
+  async install(): Promise<boolean> {
+    if (!this.deferredPrompt) {
+      return false
+    }
+    
+    this.deferredPrompt.prompt()
+    const result = await this.deferredPrompt.userChoice
+    
+    if (result.outcome === 'accepted') {
+      console.log('User accepted PWA install')
+    } else {
+      console.log('User dismissed PWA install')
+    }
+    
+    this.deferredPrompt = null
+    return result.outcome === 'accepted'
+  }
+}
+
+export const pwaService = new PWAService()