Fixed Jira Connector Search and Retrieval

Fixed several Jira connector issues related to issue search and retrieval.

This release includes:

• explore_list now respects the parent parameter instead of always returning a flat issue list
• data_by_url issue responses now include issue keys, Epic data, parent hierarchy, and linked child work
• Jira statuses now map to To Do, In Progress, and Done
• issues pagination no longer returns duplicate results on page 2
• The due_date filter for issues is now applied correctly
• Missing Jira issues requested by URL now return not-found instead of an internal error

These fixes make Jira issue retrieval more predictable across hierarchy, filtering, pagination, and URL-based workflows.