docs: point Dataset CLI to lmnr-cli (LAM-1786)

[laminar-coding-agent]

Summary

• Rewrite datasets/cli.mdx to document the standalone lmnr-cli dataset commands instead of the deprecated SDK-bundled lmnr datasets CLI.
• Swap the auth model from --project-api-key to user login (lmnr-cli login) plus directory-scoped projects, matching how lmnr-cli actually authenticates.
• Update argument order and option lists to match the lmnr-cli source in lmnr-ts (push <paths...> -n, pull [output-path] -n, create <name> <paths...> -o).
• Add a deprecation <Note> explaining lmnr-cli replaces the old lmnr datasets CLI.

Notes

• Verified command surface and flags against lmnr-ts/packages/lmnr-cli/src/index.ts and commands/dataset/index.ts.
• npx mintlify broken-links passes; no em dashes or banned marketing words.

🤖 Generated with Claude Code

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Note

Low Risk
Documentation-only changes with no runtime or security impact.

Overview
Rewrites datasets/cli.mdx so dataset workflows use the standalone lmnr-cli dataset commands instead of the deprecated SDK lmnr datasets flow, including an install section and a deprecation note.

Authentication is documented as lmnr-cli setup plus .lmnr/project.json (or --project-id), replacing LMNR_PROJECT_API_KEY / --project-api-key. Examples drop the old JS/Python tabs and use updated syntax such as push <file> -n <name> and pull <file> -n <name>.

The reference section matches lmnr-cli flags (--project-id, --json, env defaults for self-hosted --base-url / --port).

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[kolbeyang]

@laminar-coding-agent

Is this PR still necessary or have changes already been made on a different PR?

If necessary, rebase onto latest main branch.

[laminar-coding-agent]

@kolbeyang Yes, this PR is still necessary — datasets/cli.mdx on main still documents the deprecated SDK-bundled lmnr datasets CLI with LMNR_PROJECT_API_KEY auth; no other PR has updated it to lmnr-cli.

Rebased onto latest main (clean rebase, no conflicts) and force-pushed. npx mintlify broken-links passes on the rebased branch.

[laminar-coding-agent]

Done. PR #179 is still necessary — main still documents the deprecated lmnr datasets SDK CLI, and no other PR has migrated it to lmnr-cli. I rebased the branch onto latest main (clean, no conflicts), verified mintlify broken-links passes, force-pushed to the same branch (new head 7d48221, PR mergeable), and replied to @kolbeyang on the PR confirming the status.