fix(review): normalize user_id comparisons in reviewRoutes to support numeric and string IDs

[Pratyush-Panda-2006]

Description

Fixes ownership verification failures in \�ackend/routes/reviewRoutes.js. Previously, \PUT /api/reviews/:id\ and \DELETE /api/reviews/:id\ compared \existing.user_id !== req.user.id\ using strict type inequality. When MySQL returns a numeric integer \user_id\ and the JWT token holds a string ID, the strict inequality evaluation failed, rejecting legitimate review authors with 403 Forbidden.

Related Issue

Closes #1695

Clean Architecture & Changes

• Normalized comparisons with \String(existing.user_id) !== String(req.user.id)\ in both update and delete route handlers.
• Added unit tests in \�ackend/tests/reviewOwnershipType.test.js\ validating numeric and string user ID equality.

Verification

• Run
  px jest tests/reviewOwnershipType.test.js\ (All unit tests passing cleanly).

[hydra-maintainer]

🔍 Quality Gate Report

✅ All quality gates passed!

Status	Check	Details
✅	Linked Issue	PR description references a closing issue ✅

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[hydra-maintainer]

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[hydra-maintainer]

💡 Suggested reviewers based on relevant file history: @Aditya8369, @MOHITKOURAV01