test : add comprehensive unit tests for url_validator edge cases

[tmdeveloper007]

Summary of What Has Been Done

Created tests/test_url_validator.py with 40 unit tests covering all public functions in src/utils/url_validator.py:

• is_valid_url: 20 tests (valid URLs with https/http/ports/paths/query/fragments/localhost, invalid None/empty/whitespace/non-string/ftp/mailto/bare-domain/file/relative-path)
• parse_resource: 9 tests (labeled format, bare URL format, None/empty/non-string/whitespace inputs, edge cases for split marker)
• validate_resource: 4 tests (valid labeled, invalid labeled, bare valid, bare invalid)
• validate_resources: 5 tests (valid list, mixed list, empty list, non-list inputs)

Changes Made

• Created tests/test_url_validator.py with 268 lines of pytest-style tests

Impact it Made

• Increases test coverage for the url_validator module
• Documents expected behavior for all edge cases
• Catches regressions in URL validation logic

Closes #1309

Note: Please assign this PR to the tmdeveloper007 account.

[vercel]

Someone is attempting to deploy a commit to the komalsony234-1530's projects Team on Vercel.

A member of the Team first needs to authorize it.