fix: make systemd service portable across machines

- Add start-proxy.sh wrapper that handles nvm/fnm/volta/asdf
- Add install-service.sh for one-command installation
- Remove hardcoded node version paths from service file

docs/antigravity-claude-proxy.service

@@ -0,0 +1,31 @@
+# Antigravity Claude Proxy - systemd user service
+#
+# Installation:
+#   1. Copy this file to ~/.config/systemd/user/antigravity-claude-proxy.service
+#   2. Copy start-proxy.sh to a permanent location (e.g., ~/.local/bin/)
+#   3. Update PROXY_SCRIPT below to point to start-proxy.sh
+#   4. Run: systemctl --user daemon-reload
+#   5. Run: systemctl --user enable --now antigravity-claude-proxy
+#
+# Management:
+#   systemctl --user status antigravity-claude-proxy
+#   systemctl --user restart antigravity-claude-proxy
+#   journalctl --user -u antigravity-claude-proxy -f
+
+[Unit]
+Description=Antigravity Claude Proxy Server
+Documentation=https://github.com/badri-s2001/antigravity-claude-proxy
+After=network.target
+
+[Service]
+Type=simple
+# Customize the port as needed
+Environment=PORT=3001
+# Path to the wrapper script - update this to match your installation
+# The wrapper script handles nvm/fnm/volta/asdf automatically
+ExecStart=%h/.local/bin/start-proxy.sh start
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=default.target

docs/install-service.sh

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+#!/bin/bash
+# Install antigravity-claude-proxy as a systemd user service
+# Run from anywhere - automatically detects paths
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+LOCAL_BIN="$HOME/.local/bin"
+SYSTEMD_USER_DIR="$HOME/.config/systemd/user"
+
+echo "Installing antigravity-claude-proxy systemd service..."
+
+# Create directories if needed
+mkdir -p "$LOCAL_BIN"
+mkdir -p "$SYSTEMD_USER_DIR"
+
+# Copy wrapper script
+cp "$SCRIPT_DIR/start-proxy.sh" "$LOCAL_BIN/"
+chmod +x "$LOCAL_BIN/start-proxy.sh"
+echo "  Installed: $LOCAL_BIN/start-proxy.sh"
+
+# Copy service file
+cp "$SCRIPT_DIR/antigravity-claude-proxy.service" "$SYSTEMD_USER_DIR/"
+echo "  Installed: $SYSTEMD_USER_DIR/antigravity-claude-proxy.service"
+
+# Reload systemd
+systemctl --user daemon-reload
+echo "  Reloaded systemd user daemon"
+
+echo ""
+echo "Installation complete. Commands:"
+echo "  systemctl --user enable --now antigravity-claude-proxy  # Start and enable on boot"
+echo "  systemctl --user status antigravity-claude-proxy        # Check status"
+echo "  journalctl --user -u antigravity-claude-proxy -f        # View logs"

docs/start-proxy.sh

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+#!/bin/bash
+# Wrapper script for antigravity-claude-proxy that handles various Node.js version managers
+# Used by the systemd service to ensure node is available in PATH
+
+set -e
+
+# Try nvm
+if [ -z "$NVM_DIR" ]; then
+    export NVM_DIR="$HOME/.nvm"
+fi
+if [ -s "$NVM_DIR/nvm.sh" ]; then
+    source "$NVM_DIR/nvm.sh"
+fi
+
+# Try fnm
+if command -v fnm &> /dev/null; then
+    eval "$(fnm env)"
+elif [ -d "$HOME/.fnm" ]; then
+    export PATH="$HOME/.fnm:$PATH"
+    eval "$(fnm env 2>/dev/null)" || true
+fi
+
+# Try volta
+if [ -d "$HOME/.volta" ]; then
+    export VOLTA_HOME="$HOME/.volta"
+    export PATH="$VOLTA_HOME/bin:$PATH"
+fi
+
+# Try asdf
+if [ -s "$HOME/.asdf/asdf.sh" ]; then
+    source "$HOME/.asdf/asdf.sh"
+fi
+
+# Verify node is available
+if ! command -v node &> /dev/null; then
+    echo "Error: node not found in PATH after sourcing version managers" >&2
+    echo "PATH: $PATH" >&2
+    exit 1
+fi
+
+# Verify antigravity-claude-proxy is available
+if ! command -v antigravity-claude-proxy &> /dev/null; then
+    echo "Error: antigravity-claude-proxy not found in PATH" >&2
+    echo "Install with: npm install -g antigravity-claude-proxy" >&2
+    echo "PATH: $PATH" >&2
+    exit 1
+fi
+
+exec antigravity-claude-proxy "$@"