refactor: remove unused auth middleware

[agarwalpranav0711]

User description

Description

Removes the unused backend/src/middleware/auth.middleware.js file.

Problem

The repository uses ESM ("type": "module"), but this middleware uses CommonJS syntax (require and module.exports).

The file also references JWT_SECRET, which is not documented in the environment configuration.

Verification showed:

• The file is not imported anywhere.
• The file is not referenced by any route.
• The file is not executed anywhere in the application.
• Active authentication is handled by backend/src/middleware/auth.js using Firebase Authentication.

Solution

Removed the unused middleware file.

Type of Change

• Refactor

Related Issue

Fixes #4169

Testing

• Verified file is not imported anywhere.
• Verified file is not referenced anywhere.
• Confirmed active authentication uses auth.js.

Screenshots

N/A

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CodeAnt-AI Description

Remove an unused authentication middleware file

What Changed

• Removed an unused authentication middleware file that was not used by any route or active login flow
• Cleans up an outdated server-side auth check that relied on a separate token setup

Impact

✅ Less confusion around active login handling
✅ Lower risk of using outdated auth logic
✅ Cleaner backend maintenance

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