feat: optimize runtime and server context

[yimingjfe]

Summary

1. To ensure backward compatibility, supplement the context field on runtimeContext.
2. Move SSRContext into TInternalContext.
3. Remove some values that can be replaced by monitors on the server side.

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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Latest commit: 8fd9678

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