Rename project to GoSentry

Rename the application, Go module path, command package, build artifacts, resource script, and embedded icon assets from PySentry/pysentry to GoSentry/gosentry.

Move portable settings to gosentry.yaml while reading legacy pysentry.yaml during the transition, then rewrite settings under the new name.

Update Windows and Linux autostart integration to use GoSentry names while cleaning up legacy PySentry registry, desktop-entry, and systemd artifacts.

Refresh README, architecture notes, roadmap, changelog, and release examples for version 0.3.0.

assets/assets.go

@@ -14,7 +14,7 @@ import (
 // The blank import enables the compiler directive below; no runtime package
 // initialization from embed is required.
 //
-//go:embed pysentry-icon-big.png
+//go:embed gosentry-icon-big.png
 var iconBytes []byte
 
 func Icon() fyne.Resource {
@@ -22,7 +22,7 @@ func Icon() fyne.Resource {
 	// for the window icon and tray icon. The Windows Explorer icon is still added
 	// by the build script through the .ico resource, because Explorer reads PE
 	// resources rather than Fyne runtime state.
-	return fyne.NewStaticResource("pysentry-icon-big.png", iconBytes)
+	return fyne.NewStaticResource("gosentry-icon-big.png", iconBytes)
 }
 
 func IconBytes() []byte {