Bump Stoatchat RAM, limit cargo, remove xyops env

Increase Stoatchat default RAM from 8192 to 10240 in ct/stoatchat.sh and json/stoatchat.json. Add cargo -j 2 to backend builds in ct/stoatchat.sh and install/stoatchat-install.sh to limit parallel jobs. Remove two environment variables (XYOPS_xysat_local and XYOPS_masters) from install/xyops-install.sh service definition to avoid hardcoded local settings.

install/stoatchat-install.sh

@@ -39,7 +39,7 @@ fetch_and_deploy_gh_release "stoatchat" "stoatchat/stoatchat" "tarball"
 
 msg_info "Building Backend (Patience)"
 cd /opt/stoatchat
-$STD cargo build --release --bins
+$STD cargo build --release --bins -j 2
 msg_ok "Built Backend"
 
 NODE_VERSION="22" setup_nodejs

install/xyops-install.sh

@@ -56,8 +56,6 @@ Type=simple
 User=root
 WorkingDirectory=/opt/xyops
 Environment=XYOPS_foreground=1
-Environment=XYOPS_xysat_local=1
-Environment=XYOPS_masters=${LOCAL_IP}
 ExecStart=/usr/bin/node /opt/xyops/lib/main.js
 Restart=on-failure
 RestartSec=5