Resolves issue #1877, validates cursor pagination limits as numeric request input.

[david-rocca]

Closes Issue #1877

Summary

This MR fixes GET /api/cve_cursor limit validation so non-numeric and out-of-range values fail request validation before reaching pagination logic.

Important Changes

src/controller/cve.controller/index.js

• Changed limit validation from string length checking to integer range validation.
• Converts valid limit values to numbers with toInt().
• Rejects repeated/array limit query params.

test/integration-tests/cve/cursorPaginationTest.js

• Added validation coverage for non-numeric, below-minimum, and above-maximum limit values.

test/unit-tests/cve/cveGetAllTest.js

• Added coverage confirming sanitized numeric limit reaches cursor pagination.