Include the MCP server in the flavor and the offline package

Problem

The LLM flavor (application-ai-llm-flavor) depends on the index and authentication UIs only. The MCP server (application-ai-llm-mcp-ui, which pulls application-ai-llm-mcp-server) is not part of it, so an installation from the flavor, and in particular an offline installation from the XIP package, has no MCP server and the administration section advertised in the documentation is missing until the MCP extension is installed separately.

Expected

The flavor lists the MCP UI as a dependency, so that the flavor and the offline package carry every module of the application.