Add db.coll.stats() / dataSize() / storageSize(scale) / totalIndexSize()
so these MongoDB shell commands return a result grid instead of the
"Use MongoDB shell-style commands" error (issue #2529).
- backend: collStats via mongo_driver.collection_stats, wired through
mongo_ops, the dbx-web /mongo/collection-stats route, the tauri
mongo_collection_stats command, and the MCP data bridge
- node-core: parseMongoCollectionStatsCommand + result formatter and
executeQuery dispatch (web build + MCP path)
- desktop: mirror the parser/executor/autocomplete in mongoShellCommand.ts,
queryStore.ts, api/tauri/http facade, and mongoCompletion.ts
- tests for the parser, result formatter, and completion entries
Close#2529