fix: prevent dangling XMPP connections during configuration updates

- Add getConfiguration() methods to both bridges for thread-safe config access
- Refactor UpdateConfiguration() methods to prevent mutex deadlock by releasing lock before blocking operations
- Fix XMPP bridge to properly disconnect existing bridgeClient before creating new one
- Add comprehensive timeout support to XMPP client (30s connection, 10s operations, 5s ping)
- Implement proper disconnection with offline presence
- Update all interfaces to use *config.Configuration for type safety

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

server/configuration.go

@@ -57,7 +57,7 @@ func (p *Plugin) OnConfigurationChange() error {
 		return errors.Wrap(err, "failed to load plugin configuration")
 	}
 
-	p.API.LogDebug("Loaded configuration in OnConfigurationChange", "configuration", configuration)
+	p.API.LogDebug("Plugin configuration changed")
 
 	// Validate the configuration
 	if err := configuration.IsValid(); err != nil {