fix: replace hardcoded localhost URLs with NEXT_PUBLIC_API_URL

[pericharlabindhumadhavi-data]

Closes #17

Problem

The login and signup pages were hardcoding the backend URL:

• http://localhost:5000/api/auth/login
• http://localhost:5000/api/auth/signup

This causes silent failures in any deployed environment because localhost:5000 only exists on the developer's machine. Meanwhile the upload page was already correctly using process.env.NEXT_PUBLIC_API_URL — making the behavior inconsistent across the app.

Fix

Replaced hardcoded URLs in both auth pages with the same environment-variable pattern used by the upload page:

const apiUrl = process.env.NEXT_PUBLIC_API_URL || "http://localhost:5000";

This ensures:

• Works in development (falls back to localhost)
• Works in production (uses the environment variable)
• Consistent with upload page behavior

Files Changed

• src/app/auth/login/page.tsx
• src/app/auth/signup/page.tsx

Testing

• Verified the apiUrl variable is present in both files
• Behavior in development is unchanged (falls back to localhost:5000)
• In production, setting NEXT_PUBLIC_API_URL will now correctly route auth requests

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