docs: improve Installation section for AI assistant readability

[niujingjingbfsu]

Summary

When an AI assistant (e.g. Claude, Cursor) reads this README to help a user install lark-cli, it currently faces several friction points that cause it to follow a suboptimal installation path.

Problems fixed:

• The AI Agent Quick Start was positioned after the human section — AI reading top-to-bottom would see the human steps first
• No prominent redirect notice at the top of the Installation section
• Interactive steps (Steps 3 & 4) used vague wording ("run in the background", "same as above") without explaining the expected URL format or what to do with it
• No expected outputs for any step — AI couldn't verify whether a step succeeded

Changes (README.md and README.zh.md):

• Added AI redirect notice at the top of ## Installation & Quick Start
• Moved ### Quick Start (AI Agent) before ### Quick Start (Human Users)
• Removed the now-redundant buried inline AI note from the human section
• Added prerequisites note, expected outputs for all 5 steps, and clearer URL handling instructions for Steps 3 & 4

Test

Fed both old and new README to Claude with prompt "Help me install lark-cli, use only this README":

	Old README	New README
Follows AI Agent 5-step path	✓	✓
Includes node -v prereq check	✗	✓
URL format hint for auth steps	✗	✓
Per-step expected output	✗	✓

The new version produces a materially more complete installation guide.

Notes

Happy to adjust wording or structure based on feedback. The Chinese translation in README.zh.md is my best effort — native review welcome.

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