refactor: extract repeated email validation into reusable utility #548

[jikrana1]

Description

Closes #548

Refactored the repeated email validation logic into a single reusable utility function. The email regex was previously hardcoded across three different authentication routes (/signup, /login, and /forgot-password).

Changes Made

• Created a new file backend/utils/validators.js containing an exported isValidEmail(email) function.
• Updated backend/routes/authRoutes.js:
  • Imported the new isValidEmail validator.
  • Replaced the 3 duplicated const emailRegex = ... blocks with a single call to isValidEmail(email).

Benefits

• ✅ Reduces code duplication: 3 repeated validation blocks reduced to 1 shared function.
• ✅ Improves maintainability: If the email regex ever needs to be updated, it can now be done in exactly one place.

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[hydra-maintainer]

💡 Suggested reviewers based on relevant file history: @BhakktiGautam, @zaibamachhaliya

[hydra-maintainer]

🔴 PR Health Score: 40/100

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