refactor(ansible): rename freecad_mcp env vars and rework deployment

- Drop `FREECAD_MCP_` prefix from env vars (use `FREECAD_*`)
- Update freecad_mcp port from 22032 to 22061
- Document that FreeCAD bridge is required for tool calls
- Replace kottos deployment with pallas deployment

ansible/inventory/host_vars/caliban.incus.yml

@@ -41,6 +41,12 @@ freecad_mcp_user: harper
 freecad_mcp_group: harper
 freecad_mcp_directory: /srv/freecad-mcp
 freecad_mcp_port: 22061
+freecad_mcp_xmlrpc_port: 9875
+freecad_mcp_socket_port: 9876
+
+# FreeCAD MCP Bridge (GUI, runs as principal_user on the XRDP display)
+freecad_mcp_bridge_directory: "/home/{{ principal_user }}/freecad-mcp-bridge"
+freecad_mcp_bridge_display: ":10"
 
 
 # JupyterLab Configuration