lake: update lake data integration docs

[lilin90]

What is changed, added or deleted? (Required)

• Updated and added data integration docs for TiDB Cloud Lake
• Removed and added media images

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

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For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)

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Do your changes match any of the following descriptions?

• Delete files
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[gemini-code-assist]

Code Review

This pull request restructures the Data Integration documentation for TiDB Cloud Lake, introducing a modular approach that separates "Data Sources" (credentials for AWS, MySQL, PostgreSQL, and FeiShuBot) from "Integration Tasks" (S3, MySQL, and PostgreSQL). It adds new guides for PostgreSQL integration, FeiShuBot notifications, and general task management, while updating the Table of Contents and existing guides for consistency. Review feedback highlights a broken Markdown link in the PostgreSQL guide and recommends updating the integration task overview to explicitly include PostgreSQL alongside MySQL for table synchronization scenarios.

[lilin90]

/approve

[ti-chi-bot]

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