Restrict Access to Individual Listings for Non-Logged-In Users (#476)

[dipexplorer]

Fixes #476

This PR adds backend logic to restrict access to individual listings for non-logged-in users. By requiring login, this update aims to enhance user engagement and encourage account creation. When a non-logged-in user tries to view a listing, they will be redirected to the listings page with a flash message encouraging them to sign in or sign up.

Changes

• Implemented route middleware to check user authentication before allowing access to individual listing pages.
• Added logic to redirect non-logged-in users to the login page if they attempt to access a listing.
• Displayed a flash message on the login page for non-logged-in users, reading "Please sign in to view listings."

Testing Instructions

1. Pull this branch.
2. Run npm install to install dependencies.
3. Run npm test to execute the test suite.
4. Verify that ...

Screenshots (if applicable)

https://github.com/user-attachments/assets/31e5fec2-33ef-4171-84fa-74c2b932805a

Checklist

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] I am working on this issue under GSSOC

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Name	Status	Preview	Comments	Updated (UTC)
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