feat: rename service to galo, add halo branding and release build

- rename Go module, binary, systemd unit, PG_DATABASE default, frontend package and docs from shared-album to galo
- add theme-aware halo emblem and favicon (new ui-branding capability)
- add make build-release (versioned, stripped, static binary) and run the binary from the repo root

frontend/src/app.html

@@ -3,7 +3,9 @@
 	<head>
 		<meta charset="utf-8" />
 		<meta name="viewport" content="width=device-width, initial-scale=1" />
-		<link rel="icon" href="%sveltekit.assets%/favicon.png" />
+		<link rel="icon" href="%sveltekit.assets%/favicon.svg" type="image/svg+xml" />
+		<link rel="alternate icon" href="%sveltekit.assets%/favicon.png" type="image/png" />
+		<link rel="apple-touch-icon" href="%sveltekit.assets%/apple-touch-icon.png" />
 		<script>
 			(function () {
 				try {