[Task]: Implement history and logs on task

[luizhcastro]

Objective

Implement an activity history and audit log system for tasks. Track all changes made to tasks including status updates, field modifications, assignee changes, comments, and relationship updates. Provide a timeline view of all activities.

Scope

In scope:

• Create task_history entity to store activity logs
• Capture events: status changes, field updates, assignee changes, label/tag modifications
• Store old and new values for auditing
• Track user who made the change and timestamp
• GET /api/tasks/:id/history endpoint to retrieve activity log
• Pagination support for history
• Filter history by event type or date range

Out of scope:

• Real-time notifications for changes (separate issue)
• UI component to display timeline (separate issue)
• Rollback/undo functionality
• Detailed diff view for text fields

Acceptance criteria

• task_history entity created with event type, old_value, new_value, user_id, timestamp
• Automatic logging when task fields are modified
• Automatic logging when status changes
• Automatic logging when assignees change
• Automatic logging when labels/tags change
• Automatic logging when relationships are added/removed
• GET /api/tasks/:id/history endpoint working
• Pagination implemented for history endpoint
• Filter by event type parameter
• Filter by date range parameters
• Unit tests for history tracking
• API documentation updated

Deadline (optional)

No response