Adds self-hosted update system

Implements a self-hosted update mechanism, allowing the application to be updated from a corporate network share without relying on third-party services.

This includes:
- Functionality to check for updates
- Download installers
- Verify checksums
- Install updates with UAC elevation

Configuration is managed via the config.ini file, with automatic checks on startup. A new settings UI is also included.

backend/utils/ini-reader.go

@@ -18,6 +18,10 @@ type EMLyConfig struct {
 	SDKDecoderReleaseChannel string `ini:"SDK_DECODER_RELEASE_CHANNEL"`
 	GUISemver                string `ini:"GUI_SEMVER"`
 	GUIReleaseChannel        string `ini:"GUI_RELEASE_CHANNEL"`
+	Language                 string `ini:"LANGUAGE"`
+	UpdateCheckEnabled       string `ini:"UPDATE_CHECK_ENABLED"`
+	UpdatePath               string `ini:"UPDATE_PATH"`
+	UpdateAutoCheck          string `ini:"UPDATE_AUTO_CHECK"`
 }
 
 // LoadConfig reads the config.ini file at the given path and returns a Config struct