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

deploy/nginx-sse.conf

@@ -1,7 +1,7 @@
 # Пример nginx-конфигурации перед Go-бэкендом.
 # Для SSE критично proxy_buffering off, иначе события буферизуются и не доходят.
 
-upstream shared_album {
+upstream galo {
     server 127.0.0.1:8080;
 }
 
@@ -12,7 +12,7 @@ server {
     client_max_body_size 60m;
 
     location /api/sse/ {
-        proxy_pass http://shared_album;
+        proxy_pass http://galo;
         proxy_http_version 1.1;
         proxy_set_header Connection "";
         proxy_buffering off;              # иначе SSE буферизуется
@@ -22,7 +22,7 @@ server {
     }
 
     location /api/objects/ {
-        proxy_pass http://shared_album;
+        proxy_pass http://galo;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_buffering off;              # стриминг объектов без буферизации
@@ -30,7 +30,7 @@ server {
     }
 
     location / {
-        proxy_pass http://shared_album;
+        proxy_pass http://galo;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;