[Feature] Add CDS MCP server configuration to CAP skills plugin marketplace

[chuckberrry]

Summary
This issue proposes adding a bundled MCP server configuration for CAP projects so plugin users can access CDS-aware MCP tools out of the box.

Proposed MCP settings
Add the following MCP server configuration at plugin root in .mcp.json:

{
  "mcpServers": {
    "cds-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@cap-js/mcp-server"
      ],
      "env": {},
      "type": "stdio"
    }
  }
}

Current context

The repository already provides CAP-focused skills.
Some skills reference CDS MCP tools, but the plugin currently does not bundle an MCP server config for them.

Expected behavior

After installing/enabling the plugin, users get the cds-mcp server configuration bundled with the plugin.
CDS MCP tools become available without manual per-user MCP setup.