docs: make enterprise/embedded integration discoverable from the repo

[xiahjay]

Problem

Enterprise IT developers repeatedly report they don't know how to centrally integrate lark-cli into their own Agents/platforms. The capability exists and is documented — the extension mechanism (Credential / Transport / Restrict / Observer / Wrap / On) has a full guide on the Open Platform doc site (Embed lark-cli in your Agent) and the code is open-sourced under extension/ — but the repo never mentions it. The README is written entirely from the individual-developer perspective (config init → auth login), so anyone evaluating the tool on GitHub cannot discover the enterprise path: neither extension, enterprise nor embed appears anywhere in the README.

Changes

Content stays on the doc site (single source of truth); the repo only gains signposts:

• README.md / README.zh.md — add a small "Personal or Enterprise?" routing table right after Why lark-cli?: individual developers continue to Quick Start, enterprise IT / ISV get a direct link to the official embedding guide and extension/. Also adds an Enterprise entry to the nav bar, and a one-line tip that appending .md to any Open Platform doc URL returns raw Markdown (useful for AI Agents).
• extension/README.md (new, thin index) — maps the packages (credential/, transport/, platform/) to the six extension points and points to the existing platform/README.md Plugin SDK guide plus the official doc. Helps engineers who evaluate via source / pkg.go.dev.

No code changes; 3 files, +33/−2.

Summary by CodeRabbit

• Documentation
  • Updated English and Chinese README navigation with a new section for choosing between personal use and enterprise integration.
  • Added guidance and a recommendation table for individual developers versus enterprise IT/ISVs.
  • Included a note for AI agents on fetching raw Markdown by appending .md to Open Platform documentation URLs.
  • Expanded the extension embedding guide, covering integration points and linking to full embedding documentation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8ed4dbb1-226b-4f2c-a0c2-63867c58378c

📥 Commits

Reviewing files that changed from the base of the PR and between 1e516f1 and 17b297c.

📒 Files selected for processing (3)

• README.md
• README.zh.md
• extension/README.md

🚧 Files skipped from review as they are similar to previous changes (3)

• extension/README.md
• README.md
• README.zh.md

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📝 Walkthrough

Walkthrough

README navigation and onboarding sections were updated in English and Chinese, and extension/README.md now documents embedding lark-cli through credential, transport, and platform extension points.

Changes

Documentation guidance

Layer / File(s)	Summary
Onboarding navigation and paths README.md, README.zh.md	Table-of-contents links and personal, enterprise, and AI-agent documentation guidance were added or adjusted.
Extension embedding documentation extension/README.md	The extension model and credential, transport, and platform integration points are documented with a link to the full embedding guide.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• larksuite/cli#793: Updates overlapping README documentation and sections.

Suggested reviewers: caojie0621

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main doc change: exposing enterprise and embedded integration from the repo.
Description check	✅ Passed	The description covers the motivation and main changes, but it doesn't match the template exactly because it lacks Summary, Test Plan, and Related Issues sections.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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