fix: escape regex metacharacters in search to prevent ReDoSEscape search regex input

[AaravKashyap12]

Closes #3

What this PR does

Escapes user-supplied search input before using it as a MongoDB $regex in both routes/products.js and routes/stores.js:

> const safeSearch = search.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

Changes

File	Change
server/routes/products.js	Escape search input before $regex
server/routes/stores.js	Escape search input before $regex

Verification

npm test → 2 passed, 0 failing

Note

This fix escapes regex metacharacters to prevent regex injection and reduce ReDoS risk. Full-text search performance on large datasets would benefit from MongoDB text indexes or a dedicated search service, tracked separately.

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