feat: add update skill sync scope flags

[nguyenngothuong]

Summary

Add explicit update scope controls so users and automation can choose whether lark-cli update should also sync official Lark/Feishu skills. The default remains unchanged: lark-cli update still syncs skills unless --cli-only is passed.

Changes

• Add lark-cli update --cli-only to update only the CLI package and skip skills sync.
• Add lark-cli update --with-skills as an explicit form of the current default behavior.
• Reject --cli-only --with-skills before network/update work starts.
• Report skills_action: skipped in JSON output when skills sync is intentionally skipped.

Test Plan

• Unit tests pass: go test ./cmd/update -run "TestUpdateNpm_CLIOnlySkipsSkillsSync_JSON|TestUpdateNpm_WithSkillsRunsSkillsSync_JSON|TestUpdateSkillSyncFlagsMutuallyExclusive" -count=1
• Unit tests pass: go test ./cmd/update -count=1
• Manual local verification confirms the lark-cli update flow works as expected

Related Issues

• Refs [Feature Request] 允许 lark-cli update 自定义更新模式：仅更新 CLI 本体，或同时更新 CLI 与 skills #1145

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