fix(auth): remove debug console logs from production

[Prateek2007-cmd]

Description

This PR resolves Issue 5: Debug Statements Left in Production.
Closes #2251
Debugging statements (console.log and console.error) were left active in the register.js file. Leaving these in production can clutter the browser console, degrade performance marginally, and most importantly, potentially leak sensitive application state or API response data to the client-side.

This PR scrubs those statements from the frontend script. (Note: Logs in verify_env.js were intentionally retained, as that is a server-side environment validation tool where console output is required and correct).

Changes Made

• Removed console.log("register.js loaded"); from register.js
• Removed console.error("Submit button not found!"); from register.js
• Removed console.log("Success:", data); from register.js
• Removed console.error(err); from register.js

Type of Change

• Code hygiene / Refactoring
• Security improvement

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