Add Software Vendor galaxy and 1,000-entry cluster

[adulau]

Motivation

• Provide a MISP galaxy for mapping software vendors so analysts can tag and reference vendor-level information in sightings and events.
• Populate a large, immediately useful cluster of vendors (top 1,000) with basic metadata and product lists so tools and users can reference vendor homepages and product portfolios.

Description

• Added a new galaxy definition at galaxies/software-vendor.json with type software-vendor and basic metadata so MISP can recognize the new galaxy type.
• Added a new cluster at clusters/software-vendor.json containing 1,000 vendor entries generated from GitHub organization rankings; each entry includes value, description, uuid, and meta with official-refs (main page), refs (GitHub API org endpoint), and a products array.
• The vendor list was built from GitHub organization search (type:org followers:>=200, sorted by followers) across the first 10 pages (100 results/page) to assemble the top 1,000 entries and assigned unique UUIDs.
• Files added: galaxies/software-vendor.json and clusters/software-vendor.json (1,000 entries).

Testing

• Ran repository validations with ./validate_all.sh and repository formatting/normalization with ./jq_all_the_things.sh, and fixed formatting as required; both checks completed successfully.
• Performed a Python sanity check confirming the cluster contains 1,000 values (output: len(values) == 1000).
• Committed the two new files and created the pull request; automated validation and formatting checks in the repository passed.

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Codex Task