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

backend/internal/reconcile/reconcile.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"time"
 
-	"shared-album/internal/storage"
+	"galo/internal/storage"
 )
 
 // Result holds the two kinds of divergence between storage and the journal.

backend/internal/reconcile/reconcile_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"shared-album/internal/storage"
+	"galo/internal/storage"
 )
 
 func TestClassify(t *testing.T) {