fix: resolve targetTags reference in related products

[hashhhh-16]

Summary

Fixes a bug in the related products endpoint where tag matching incorrectly referenced targetTags instead of targetTagsSet.

Changes Made

• Replaced targetTags.has(tag.toLowerCase()) with targetTagsSet.has(tag.toLowerCase()) in getRelatedProducts.
• Ensures related products are scored correctly based on matching tags.
• Prevents runtime issues caused by referencing an undefined variable.

Testing

• Verified the related products logic uses the correct tag set for matching.
• Confirmed the application builds and lint checks pass after the fix.

Issue

Closes #502

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[Aamod007]

LGTM