feat(demo): add new CLI demo covering all supported file formats

[cherkanovart]

Adds a runnable demo for the new @lingo.dev/cli under demo/new-cli/, alongside the existing compiler demos.

What's inside

• .lingo/config.json with one files[] entry per supported format (no org/engine binding, so users run lingo link to connect their own).
• content/en/ sources covering every format: JSON, JSONC, Markdown, MDX, Markdoc, OpenAPI YAML, each exercising a format-specific option (lockedKeys, preservedKeys, translateFrontmatterFields, translateComponentProps).
• content/de|fr|es/ sample output plus .lingo/lock.json, matching the old CLI demo pattern (committed translations).
• README.md: get via degit, then login -> link -> push --estimate (preview cost) -> push -> pull.

Verified

Ran the full flow end to end against a real engine on @lingo.dev/cli@1.7.0: push submitted the async run, pull wrote 18 target files, translations are real (lockedKeys honored), and push --estimate returns a per-locale cost breakdown.

No changeset: @lingo.dev/demo-new-cli is private, nothing published.

Summary by CodeRabbit

• New Features

  • Added a new demo CLI project showcasing end-to-end localization across English, German, Spanish, and French.
  • Includes locale configuration and a pinned translation lock, plus sample content covering app strings, settings, documentation, and OpenAPI API specs.

• Documentation

  • Added a complete demo README with the expected folder structure, supported file formats, and step-by-step CLI commands (login/link/push/pull) to get started quickly.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 933f9411-35fa-4a76-806d-9ea03104c659

📥 Commits

Reviewing files that changed from the base of the PR and between 7c0a61c and 4182b6d.

📒 Files selected for processing (1)

• .changeset/cute-mice-smash.md

✅ Files skipped from review due to trivial changes (1)

• .changeset/cute-mice-smash.md

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📝 Walkthrough

Walkthrough

A new demo/new-cli project is added containing an npm package manifest, a Lingo CLI configuration with per-file translation rules, a SHA-256 lock file, a README, English source content in six formats (JSON, JSONC, Markdown, MDX, Markdoc, OpenAPI YAML), and translated outputs for German, Spanish, and French.

Changes

new-cli Demo Project

Layer / File(s)	Summary
Project scaffold and CLI configuration demo/new-cli/package.json, demo/new-cli/.lingo/config.json, demo/new-cli/.lingo/lock.json, demo/new-cli/README.md, .changeset/cute-mice-smash.md	package.json registers the private @lingo.dev/demo-new-cli package. config.json sets en as source locale with de, fr, es as targets, and configures per-file rules: key locking (meta.version in app.json), key preservation (featureFlags in settings.jsonc), frontmatter-only translation (guide.md, changelog.mdoc), component-prop translation (landing.mdx), and yaml-openapi format for api.yaml. lock.json pins SHA-256 checksums for all 18 translated output files. README documents the demo structure and CLI commands. Changeset marks this as a demo-only addition.
English source content demo/new-cli/content/en/app.json, demo/new-cli/content/en/settings.jsonc, demo/new-cli/content/en/guide.md, demo/new-cli/content/en/landing.mdx, demo/new-cli/content/en/changelog.mdoc, demo/new-cli/content/en/api.yaml	Adds the six English source files that exercise each supported format: app.json with nav/CTA strings and meta.version; settings.jsonc with translatable labels and preserved boolean featureFlags; guide.md with frontmatter and getting-started body; landing.mdx with Hero and Callout components demonstrating translateComponentProps; changelog.mdoc with Markdoc callout and versioned entries; api.yaml as an OpenAPI 3.0.3 spec for /products.
Translated locale outputs (de, es, fr) demo/new-cli/content/de/*, demo/new-cli/content/es/*, demo/new-cli/content/fr/*	Adds all 18 translated content files (6 per locale) for German, Spanish, and French. Each mirrors the English source structure: app.json with locale nav/CTA copy and identical meta.version; settings.jsonc with translated labels and unchanged featureFlags booleans; guide.md with translated frontmatter and body; landing.mdx with translated Hero/Callout props; changelog.mdoc with translated version entries; api.yaml with locale-specific descriptions on the same two GET endpoints.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested labels

community

Suggested reviewers

• sumitsaurabh927

Poem

🐇 Hop, hop, across languages three,
De, es, and fr — all translated with glee!
A config locks keys, a lock pins the hash,
Six formats translated in one speedy dash.
The bunny says: push, then pull, and you're done! 🌍

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description deviates from the template structure; it lacks a summary sentence, missing testing section with checkboxes, no visuals section, and incomplete checklist items.	Restructure the description to match the template: add a one-sentence summary, include testing section with checkboxes for validation, add visuals section if applicable, and complete the checklist with proper checkbox format.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding a new CLI demo covering all supported file formats.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/new-cli-demo

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