Add +form-public-link command to generate or read form share links

Summary

Currently lark-cli can create forms (+form-create), configure questions (+form-questions-create), and submit form responses (+form-submit), but cannot generate or enable public share links for a form. Users must open the Base web UI to enable external/anonymous form access and copy the share URL.

Problem

When building agent workflows that involve form collection, the CLI cannot complete the full cycle — it stops at form creation and response submission, leaving the share-link step as a manual web UI operation.

Proposed Solution

Add a +form-public-link shortcut (or separate +form-share-create / +form-share-read commands) that wraps the underlying /open-apis/base/v1/forms/{form_id}/versions/{version_id}/sharing endpoint:

• Generate a new share token / public link for a form
• Read the current share link for a form (if already enabled)
• Optionally enable/disable public access

Use Case

An AI agent sets up a customer intake form via CLI, enables the public share link in the same session, and sends the link to the customer — all without touching the web UI.

Notes

This gap was noted by a collaborator in #1221: the Base Form + Workflow workflow is otherwise complete via CLI except for this share-link step.

Start by reading the existing +form-create, +form-questions-create, and +form-submit commands, then inspect the /open-apis/base/v1/forms/{form_id}/versions/{version_id}/sharing endpoint described here. Define whether the command generates, reads, and optionally toggles a public link, and consider the work done when the full form workflow no longer requires the web UI.