feat: Require email verification after signup to restrict access (#371)

[Aryanbuha890]

Description

This PR resolves #371 by adding an email verification step after user signup. Logged-in users who are not yet verified will have restricted access until they verify their email.

Changes Made

1. Database & Model Changes

• Added a UserProfile model containing an is_verified boolean field (linked one-to-one with standard User).
• Configured a Django signal post_save receiver to automatically create user profiles for new signups.
• Generated database migration 0006_userprofile.

2. Backend Views & Endpoint Verification

• Modified SignupSerializer to require a unique email on registration.
• Subclassed JWT's TokenObtainPairSerializer to return verification claims inside login tokens and responses.
• Updated the signup view to sign a verification token (using Django TimestampSigner) and output/send the link.
• Added API endpoints for email verification, status verification, and resending links.
• Protected all authenticated workspace routes (upload, history, compare) with custom verification checks, rejecting requests with HTTP 403.

3. Frontend States & Dashboard UX

• Updated useAuth.ts to manage email registration parameters and handle periodic status verification polling.
• Exposed the email field inside AuthModal.tsx during signup.
• Created VerifyEmailPage.tsx to process the cryptographically signed token and output success/failure feedback.
• Rendered an orange warnings banner at the top of the app to resend verification link, and blurred out/overlayed the resume analyzer form with a lock layout for unverified users.

Verification Results

• Database migrations successfully applied.
• All 27 unit tests passed successfully:

  Ran 27 tests in 12.162s
  OK

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[Aryanbuha890]

@Muskankr Please review this and check it.

[Muskankr]

@Aryanbuha890 , Please resolve CI failing issue as it will cause deployment fail after merge.

[Aryanbuha890]

@Aryanbuha890 , Please resolve CI failing issue as it will cause deployment fail after merge.

@Muskankr Please now see, I resolve the all errors.

[Muskankr]

@Aryanbuha890 , Still merge conflicts and ci failing

[Aryanbuha890]

@Aryanbuha890 , Still merge conflicts and ci failing

I have done it.

Please check now

[Aryanbuha890]

@Muskankr Please check it these.

[Muskankr]

@Aryanbuha890 , resolve conflicts!

[Muskankr]

@Aryanbuha890 , Still merge conflicts