Add Freshservice MCP server for Cowork deployment

Cowork runs the agent in an isolated VM, so the uploaded skill can't see host
credentials or reach the Freshservice host. Add an HTTP/streamable MCP server
(bearer-auth, Dockerfile, compose) to run as a container on the LAN box and
connect via mcp-remote like the existing sharepoint-lists server. The skill
remains the right tool for the non-sandboxed Claude Code CLI.

Also gitignore mcp-server/.env and include the desktop skill install package.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -3,3 +3,6 @@ __pycache__/
 .env
 .DS_Store
 # Credentials live in ~/.freshservice/credentials, never in the repo.
+
+# MCP server runtime secrets
+mcp-server/.env