[@mantine/mcp-server] Handle CLI metadata flags

[SyntaxHQDEV]

Summary

Handles top-level CLI metadata flags in the @mantine/mcp-server bin entrypoint before the MCP server is required:

• mcp-server --help / -h prints concise usage and exits 0
• mcp-server --version / -v prints the package version and exits 0
• unknown top-level flags print a short error and exit non-zero

Normal server startup remains unchanged when no flags are passed.

Fixes #8965

Verification

node packages/@mantine/mcp-server/bin/mcp-server.cjs --help
node packages/@mantine/mcp-server/bin/mcp-server.cjs --version
node packages/@mantine/mcp-server/bin/mcp-server.cjs --definitely-not-a-real-flag