Replace status_id with in_progress boolean field

- Remove task_statuses lookup table and StatusID foreign key
- Add InProgress boolean field to Task model
- Add database migration (005_replace_status_with_in_progress)
- Update all handlers, services, and repositories
- Update admin frontend to display in_progress as checkbox/boolean
- Remove Task Statuses tab from admin lookups page
- Update tests to use InProgress instead of StatusID
- Task categorization now uses InProgress for kanban column assignment

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/dto/requests/task.go

@@ -59,8 +59,8 @@ type CreateTaskRequest struct {
 	Description   string           `json:"description"`
 	CategoryID    *uint            `json:"category_id"`
 	PriorityID    *uint            `json:"priority_id"`
-	StatusID      *uint            `json:"status_id"`
 	FrequencyID   *uint            `json:"frequency_id"`
+	InProgress    bool             `json:"in_progress"`
 	AssignedToID  *uint            `json:"assigned_to_id"`
 	DueDate       *FlexibleDate    `json:"due_date"`
 	EstimatedCost *decimal.Decimal `json:"estimated_cost"`
@@ -73,8 +73,8 @@ type UpdateTaskRequest struct {
 	Description   *string          `json:"description"`
 	CategoryID    *uint            `json:"category_id"`
 	PriorityID    *uint            `json:"priority_id"`
-	StatusID      *uint            `json:"status_id"`
 	FrequencyID   *uint            `json:"frequency_id"`
+	InProgress    *bool            `json:"in_progress"`
 	AssignedToID  *uint            `json:"assigned_to_id"`
 	DueDate       *FlexibleDate    `json:"due_date"`
 	EstimatedCost *decimal.Decimal `json:"estimated_cost"`