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 {

frontend/src/lib/components/AppShell.svelte

@@ -2,6 +2,7 @@
 	import { onMount } from 'svelte';
 	import { goto } from '$app/navigation';
 	import { authApi } from '$lib/api';
+	import Emblem from './Emblem.svelte';
 	import Icon from './Icon.svelte';
 	import ThemeSwitcher from './ThemeSwitcher.svelte';
 	import { auth } from '$lib/stores/auth.svelte';
@@ -115,7 +116,7 @@
 				<Icon name="menu" class="size-4" />
 			</button>
 			<a href="/" class="inline-flex items-center gap-1.5 truncate text-sm font-semibold">
-				<Icon name="photo_camera" class="size-4" />
+				<Emblem class="text-primary size-4" />
 				Galo
 			</a>
 		</div>

frontend/src/lib/components/Emblem.svelte

@@ -0,0 +1,28 @@
+<script lang="ts">
+	interface Props {
+		label?: string;
+		class?: string;
+	}
+
+	let { label, class: className = 'size-5' }: Props = $props();
+</script>
+
+<svg
+	viewBox="0 0 64 64"
+	class={className}
+	role={label ? 'img' : undefined}
+	aria-label={label}
+	aria-hidden={label ? undefined : 'true'}
+	focusable="false"
+>
+	<circle cx="32" cy="32" r="13" fill="currentColor" />
+	<circle
+		cx="32"
+		cy="32"
+		r="24"
+		fill="none"
+		stroke="currentColor"
+		stroke-width="6"
+		stroke-opacity="0.45"
+	/>
+</svg>

frontend/src/routes/(public)/+layout.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import ThemeSwitcher from '$lib/components/ThemeSwitcher.svelte';
-	import Icon from '$lib/components/Icon.svelte';
+	import Emblem from '$lib/components/Emblem.svelte';
 
 	let { children } = $props();
 </script>
@@ -9,7 +9,7 @@
 	<header class="border-border bg-chrome border-b">
 		<div class="mx-auto flex max-w-6xl items-center justify-between px-4 py-3">
 			<a href="/" class="inline-flex items-center gap-2 text-lg font-semibold">
-				<Icon name="photo_camera" />
+				<Emblem class="text-primary size-6" />
 				Galo
 			</a>
 			<ThemeSwitcher />