zh: add tidb operator overview

[liubog2008]

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What is changed, added, or deleted? (Required)

Which TiDB Operator version(s) do your changes apply to? (Required)

• master (the latest development version)
• v2.0 (TiDB Operator 2.0 versions)
• v1.6 (TiDB Operator 1.6 versions)
• v1.5 (TiDB Operator 1.5 versions)
• v1.4 (TiDB Operator 1.4 versions)
• v1.3 (TiDB Operator 1.3 versions)

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[fgksgf]

create an empty doc v2-vs-v1.md to make linter happy?

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-05-26 07:38:57.513845741 +0000 UTC m=+254667.885633203: ☑️ agreed by Oreoxmt.

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