docs: add data lineage guide and SQL references

[youngsofun]

Summary

Documentation update for:

• feat(query): backport data lineage to v1.2.925 databend#20417: feat(query): backport data lineage to v1.2.925

This PR:

• adds English and Chinese Data Lineage guides under Data Management;
• explains how to enable lineage for self-hosted Query nodes and configure retention;
• documents the GET_LINEAGE table function and REFRESH LINEAGE FOR ALL VIEWS command;
• adds the supplied Databend Cloud lineage graph screenshot; and
• links the new pages from Data Management, Table Functions, View, and Query configuration indexes.

Motivation

The data lineage feature introduces new configuration and SQL interfaces, but users need a concise workflow for enabling it, exploring upstream and downstream relationships, and backfilling lineage for views that existed before the feature was enabled. These pages provide that workflow without exposing internal persistence details.

Languages

• English (docs/en/)
• Chinese (docs/cn/)

Testing

• npm run build:en
• npm run build:cn
• cargo test -p databend-common-ast --test it test_statement -- --nocapture (2/2 passed)
• SQL examples cross-checked against the lineage sqllogic tests and schemas in feat(query): backport data lineage to v1.2.925 databend#20417
• No static SQL result sets require output verification

Related

• Source PR: feat(query): backport data lineage to v1.2.925 databend#20417

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[youngsofun]

Superseded by #3493, which uses a branch in the upstream databendlabs/databend-docs repository.