refactor: migrate browser gateway to native xvfb

deploy/browser-gateway.env.example

@@ -0,0 +1,16 @@
+# Copy to ~/.config/creatorhub/browser-gateway.env and replace the token.
+LISTEN_ADDR=0.0.0.0:8081
+GATEWAY_TOKEN=replace-with-at-least-16-random-characters
+BROWSER_STATE_DIR=~/.local/state/creatorhub/browser-gateway
+BROWSER_PROFILE_ROOT=~/.local/share/creatorhub/browser-profiles
+BROWSER_VERSION=148.0.7778.215
+BROWSER_PATH=~/.local/share/creatorhub/browsers/fingerprint-chromium/148.0.7778.215/chrome
+NODE_NAME=
+RUNTIME_CLEANUP_TIMEOUT=30
+RUNTIME_READY_TIMEOUT=15
+RUNTIME_MIN_FREE_BYTES=21474836480
+RUNTIME_LOG_MAX_BYTES=1073741824
+PROFILE_CACHE_MAX_BYTES=21474836480
+# Optional single-node manual observation only: reuse an already-running Xvfb.
+# Keep this unset for the normal per-runtime isolated Xvfb mode.
+# RUNTIME_EXTERNAL_DISPLAY=99

deploy/creatorhub-browser-gateway.service.in

@@ -0,0 +1,18 @@
+[Unit]
+Description=CreatorHub native browser gateway
+After=graphical-session.target
+
+[Service]
+Type=simple
+WorkingDirectory=@PROJECT_DIR@
+EnvironmentFile=%h/.config/creatorhub/browser-gateway.env
+ExecStart=/usr/bin/python3 -m cmd.browser_gateway.gateway
+Restart=on-failure
+RestartSec=5
+UMask=0077
+NoNewPrivileges=yes
+PrivateTmp=no
+LimitNOFILE=8192
+
+[Install]
+WantedBy=default.target