docs: document async loading sub-parameters

[adity982]

Summary

• document every async-loading CLI sub-parameter with its runtime default and behavior
• explain readiness, timeout, batching, and notification tradeoffs for small and large server fleets
• add matching guidance and an example to both the English and Chinese fast-startup guides

Validation

• targeted Prettier check for both guides
• pnpm docs:build

Closes #393

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[xizhibei]

Thank you for your contribution. I noticed this is still marked as a draft — would you like any further revisions, or is it ready to be merged?