cloud: remove non-Premium content and add Premium-specific links

[Oreoxmt]

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[gemini-code-assist]

Code Review

This pull request wraps the 'Hotspot issues' section and subsequent content within a <CustomContent> block restricted to specific TiDB Cloud plans. A review comment identifies that a general link for SQL optimization was inadvertently included in this plan-specific block; it suggests moving the closing tag to ensure the link remains visible to all users, including those on the Premium plan.

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[LGTM Timeline notifier]

Timeline:

• 2026-05-06 13:25:44.450917844 +0000 UTC m=+274217.324267816: ☑️ agreed by hfxsd.