Update app configuration and plugin manager for improved environment variable support

- Modify app configuration to use environment variables for base URL and API key, enhancing flexibility for different environments.
- Refactor plugin installation logic in the PluginManager to ensure proper configuration object structure.
- Update base module initialization to correctly access Nostr relay options from the configuration, improving reliability.

src/app.config.ts

@@ -55,8 +55,8 @@ export const appConfig: AppConfig = {
       lazy: false,
       config: {
         apiConfig: {
-          baseUrl: 'http://lnbits',
-          apiKey: 'your-api-key-here'
+          baseUrl: import.meta.env.VITE_LNBITS_BASE_URL || 'http://localhost:5000',
+          apiKey: import.meta.env.VITE_API_KEY || ''
         },
         ticketValidationEndpoint: '/api/tickets/validate',
         maxTicketsPerUser: 10