Fix/remove smtp secrets env example

[Atibali]

Team Number : Team 137

Description

This PR fixes a Level-2 security issue by removing sensitive SMTP credentials from .env.example.
The environment template now contains placeholder values only, preventing accidental credential exposure in version control.

Related Issue

Closes #75

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Style/UI improvement

Changes Made

• Replaced hardcoded SMTP_USER value in .env.example with a safe placeholder.
• Replaced hardcoded SMTP_PASS value in .env.example with a safe placeholder.
• Verified no real SMTP credentials remain in tracked template configuration.

Screenshots (if applicable)

Before:
N/A (backend configuration/security fix)

After:
N/A (backend configuration/security fix)

Testing

• Tested on Desktop (Chrome/Firefox/Safari)
• Tested on Mobile (iOS/Android)
• Tested responsive design (different screen sizes)
• No console errors or warnings
• Code builds successfully (npm run build)

Additional verification performed:

• Confirmed .env is not tracked in git.
• Confirmed .env.example contains placeholders for SMTP_USER and SMTP_PASS.

Checklist

• My code follows the project's code style guidelines
• I have performed a self-review of my code
• I have commented my code where necessary
• My changes generate no new warnings
• I have tested my changes thoroughly
• All TypeScript types are properly defined
• Tailwind CSS classes are used appropriately (no inline styles)
• Component is responsive across different screen sizes
• I have read and followed the CONTRIBUTING.md guidelines

Additional Notes

• No functional API logic was changed; this is a security hardening change in configuration templates only.
• Maintainers should rotate/revoke previously exposed SMTP credentials immediately.

[krishnapaljadeja]

✅ PR Validation Passed

Hey @Atibali! Your PR looks good. Here is what we found:

Field	Value
Team Number	Team 137
Linked Issue	Closes #75

A maintainer will review your PR within 24–48 hours. Stay responsive to feedback!

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[krishnapaljadeja]

@Atibali Please revert all non-related changes and keep this PR strictly limited to .env.example.
If the controller changes are necessary, feel free to open a separate PR with a clear description and rationale.

This helps keep reviews focused, avoids unintended side effects, and maintains a clean project history.

Thanks!

[krishnapaljadeja]

🎉 PR Merged — Points Awarded!

Congratulations @Atibali! Your contribution has been merged.

Field	Value
Repo	Code_duel_backend
Team	Team 137
Contributor	@Atibali
Level	Level 1 — Beginner
Points Awarded	5 pts
Source	Linked Issue #75

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