Issue 5: 🔒 Guest Fetch Limits

[sumit1642]

Description:

• Guests can browse but only up to 20 tag-fetch requests.

• After the 20th request, show a prompt to register/login.

• Logged-in users have unlimited fetches.

Why it matters:

• Prevents abuse (bots, spammers).

• Pushes heavy users to become registered members.

Acceptance Criteria:

• Middleware tracks guest fetch counts (via cookie, session, or IP).

• After 20 fetches → deny request with a 401 Unauthorized + custom message.

• Frontend displays a friendly prompt: “Create an account to continue browsing.”