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feat(devtools-mcp-server): add DevTools MCP server and OpenCode plugin

Add @mongodb-js/devtools-mcp-server, which manages local MongoDB deployments
with mongodb-runner and ships an OpenCode plugin that registers both this
server and the official MongoDB MCP server.

- Cluster tools: start (standalone, replica set with analytics members,
  sharded with per-shard config and mongos args, DSC/SLS), list, get, logs,
  prune and stop, with progress notifications while starting.
- Fixtures, arbitrary database commands and fail points, addressed by cluster
  id through the runner registry so no connection string is needed.
- The package root is the OpenCode plugin (registers the devtools and mongodb
  MCP servers); the library API lives at ./server. prepare builds dist for git
  installs.
- Database CRUD, aggregation, indexes and schema come from the official
  mongodb-mcp-server; only operations without an equivalent (run_command,
  fixture files, fail points) stay in this package.