Enforce Daily Analysis Usage Limits for Free Users

[Sumedh-6504]

Description

Enforce the usage limit of 10 analyses per day for users on the "free" tier. When a user reaches this limit, block further uploads and prompt them to upgrade to the "pro" tier.

User Story

As a LexGuard administrator,
I want the system to count daily scans for free users,
So that we prevent API abuse and incentivize Pro tier conversions.

Technical Tasks

• Write a helper function on the server to query how many documents a user has uploaded in the current calendar day.
• Implement middleware or gatekeeper logic inside app/api/analyze/route.ts to check if user.plan === 'free' and total scans today >= 10.
• If the limit is reached, return a 403 Forbidden response: { error: "Daily limit reached. Upgrade to Pro for unlimited analyses." }.
• Add visual feedback in the upload page UI (app/(app)/upload/page.tsx) showing a progress bar of scans remaining today (e.g. "3 of 10 scans remaining today").