feat: enhance systemd unit and install script for browser dependencies

Updated the systemd unit generation to include the virtual environment and node modules in the PATH, improving the execution context for the hermes CLI. Additionally, added support for installing Playwright and its dependencies on Arch/Manjaro systems in the install script, ensuring a smoother setup process for browser tools.

hermes_cli/gateway.py

@@ -157,6 +157,12 @@ def generate_systemd_unit() -> str:
     import shutil
     python_path = get_python_path()
     working_dir = str(PROJECT_ROOT)
+    venv_dir = str(PROJECT_ROOT / "venv")
+    venv_bin = str(PROJECT_ROOT / "venv" / "bin")
+    node_bin = str(PROJECT_ROOT / "node_modules" / ".bin")
+
+    # Build a PATH that includes the venv, node_modules, and standard system dirs
+    sane_path = f"{venv_bin}:{node_bin}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
     
     hermes_cli = shutil.which("hermes") or f"{python_path} -m hermes_cli.main"
     return f"""[Unit]
@@ -168,6 +174,8 @@ Type=simple
 ExecStart={python_path} -m hermes_cli.main gateway run --replace
 ExecStop={hermes_cli} gateway stop
 WorkingDirectory={working_dir}
+Environment="PATH={sane_path}"
+Environment="VIRTUAL_ENV={venv_dir}"
 Restart=on-failure
 RestartSec=10
 KillMode=mixed