[doc](data-integration) Add LibreDB Studio integration guide

[kaya-abdullah]

What this PR does

Adds a new integration guide for LibreDB Studio, an open source (MIT licensed), browser-based SQL IDE, alongside the existing DataGrip, DBeaver and CloudDM pages under Database Development and Management.

LibreDB Studio connects to Doris over the MySQL wire protocol (there is no separate Doris connection type, MySQL is selected). Content covers:

• Prerequisites and running LibreDB Studio (Docker, Helm chart, or npm package)
• Connecting to Doris: connection type, fields, testing and establishing the connection
• Browsing and querying the internal catalog
• A Known limitations table naming the gaps worth knowing before relying on a panel: the overview and health panels (SHOW STATUS LIKE is a parse error in Doris's grammar), no index information, foreign keys accepted but not enforced, the Explain button (EXPLAIN FORMAT='json' does not parse, a plain EXPLAIN does), and the background-statistics lag on a freshly loaded table

Every claim in the guide was verified against a real apache/doris:all-in-one-4.1.3 container and a real LibreDB Studio instance, screenshotted from the actual application.

Versions

• dev
• 4.x
• 3.x
• 2.1 or older (not covered by version/language sync gate)

Languages

• Chinese
• English

Docs Checklist

• Checked by AI
• Test Cases Built
• Updated required version and language counterparts, or explained why not
• If only one language changed, confirmed whether source/translation counterparts need sync

Note: 3.x and 2.1 still use the older ecosystem/bi/ layout for this category rather than connection-integration/data-integration/, so they are intentionally left unchanged, matching how the existing DataGrip/DBeaver/CloudDM pages are scoped to dev and 4.x only.