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/group_vars/all/vars.yml

@@ -41,6 +41,7 @@ openwebui_rel: 0.8.3
 pulseaudio_module_xrdp_rel: devel
 searxng_oauth2_proxy_version: 7.6.0
 # Git ref (branch, tag, or commit) - https://github.com/heluca/freecad-addon-robust-mcp-server
+# Used for both the pip-installed MCP server and the staged GUI bridge tarball.
 freecad_mcp_git_ref: "main"
 
 # Docker image versions (third-party)