docs: add a third-party tools section with LibreDB Studio

[kaya-abdullah]

Summary

The Client tools page documents the four tools Redis maintains. This adds a "Third-party tools" section for community-maintained tools that connect to Redis, with one entry: LibreDB Studio, an MIT-licensed self-hosted database GUI.

The archived redis/redis-doc repository carried a curated third-party tool list under tools/gui (redis-commander, AnotherRedisDesktopManager, medis, p3x-redis-ui and others). That list did not carry over to this repository, so there is currently no page in the docs where a community tool can be documented. If leaving that surface closed is a deliberate decision, say so and I will close this.

Scope

• One file changed: content/develop/tools/_index.md.
• Adds a section, one entry, and one line to the intro list. The four Redis-maintained tools are untouched, and the new section is explicit about who supports what is listed under it.
• The entry states what the tool does not support (Cluster, Sentinel, TLS), so a reader is not sent to it with a managed, TLS-only endpoint.

Validation

• Every claim in the entry comes from the project's own Redis provider reference: https://github.com/libredb/libredb-studio/blob/main/docs/providers/redis.md
• Repository: https://github.com/libredb/libredb-studio, MIT licence, built on ioredis.
• Affiliation: I maintain LibreDB Studio.

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Note

Low Risk
Documentation-only change to a single markdown page; no product code, auth, or runtime behavior.

Overview
The Client tools page (content/develop/tools/_index.md) gains a Third-party tools section for community-maintained clients, separate from Redis-owned tools.

The intro bullet list now links to that section. The new content states that listed third-party tools are author-supported, and documents LibreDB Studio (self-hosted multi-engine GUI with Redis via ioredis), including capabilities (console, SCAN-based key browser, INFO/CLIENT LIST/SLOWLOG views) and explicit limits: standalone only, no Cluster/Sentinel/TLS, ACL-based read-only access.

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