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/core/plugin-manager.ts

@@ -96,7 +96,7 @@ export class PluginManager {
         throw new Error('Plugin manager not initialized')
       }
 
-      await plugin.install(this.app, config.config)
+      await plugin.install(this.app, { config: config.config })
 
       // Register routes if provided
       if (plugin.routes && this.router) {