Add Seafile service and update Caddyfile

- seafile/: docker compose setup (seafile-mc 13, mariadb, redis, seadoc, caddy-proxy)
- Expose seafile on 127.0.0.1:8078, proxied via Caddy at docs.alogins.net
- Fix: SEAFILE_SERVER_PROTOCOL=https to avoid CSRF errors
- Fix: TIME_ZONE=Asia/Dubai (Etc/UTC+4 was invalid)
- Caddyfile: add docs.alogins.net → localhost:8078
- .gitignore: exclude seafile/.env (credentials stored in Vaultwarden)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Caddyfile

@@ -77,6 +77,10 @@ ntfy.alogins.net {
 	reverse_proxy localhost:8840
 }
 
+docs.alogins.net {
+	reverse_proxy localhost:8078
+}
+
 vw.alogins.net {
 	reverse_proxy localhost:8041
 }