Fix backend crash, missing imports, and update dependencies

[rizwan749]

Description
This PR resolves the critical installation and startup bugs in the backend folder. The following specific fixes have been implemented:

1. package.json & package-lock.json: Fixed a structural JSON syntax error (EJSONPARSE) caused by misplaced brackets and the test script being placed outside the main scripts block. This now allows npm install to run cleanly without errors.
2. src/server.js: Resolved immediate runtime crashes during npm run dev by fixing missing core imports and correcting undefined variable references that were breaking the server initialization.
3. src/routes/authRoutes.js: Fixed broken routing definitions and missing dependency imports to ensure smooth authentication endpoint handling.

Closes #171

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)

Checklist:

• I have linked the specific issue ([BUG] EJSONPARSE error in package.json and backend server crashes #171) that this PR resolves.
• I have described my changes in detail according to the modified files.
• I have tested my changes locally, and the server syntax/imports are fully verified.
• My changes do not introduce any new breaking changes.
• I have performed a self-review of my own code.

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[github-actions]

❌ PR Format Check — Failed — Please Fix Below

Hi @rizwan749! Please fix the issues below before your PR can proceed to mentor review.

❌ Must Fix Before Proceeding

❌ Title format invalid — Use Conventional Commits format

Examples: feat: add login page, fix: button alignment, docs: update readme

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Run: git checkout -b feat/your-feature-name

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EventOne × GSSoC Pipeline — Stage 1 Automated Check

[anubhavxdev]

Hey @rizwan749! Closing this as it does not follow Conventional Commits format. Your newer PR #180 looks better — please make sure it has proper description and links an issue!