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/models/task_test.go

@@ -24,11 +24,6 @@ func TestTaskPriority_TableName(t *testing.T) {
 	assert.Equal(t, "task_taskpriority", p.TableName())
 }
 
-func TestTaskStatus_TableName(t *testing.T) {
-	s := TaskStatus{}
-	assert.Equal(t, "task_taskstatus", s.TableName())
-}
-
 func TestTaskFrequency_TableName(t *testing.T) {
 	f := TaskFrequency{}
 	assert.Equal(t, "task_taskfrequency", f.TableName())
@@ -134,28 +129,6 @@ func TestTaskPriority_JSONSerialization(t *testing.T) {
 	assert.Equal(t, "#e74c3c", result["color"])
 }
 
-func TestTaskStatus_JSONSerialization(t *testing.T) {
-	status := TaskStatus{
-		Name:         "In Progress",
-		Description:  "Task is being worked on",
-		Color:        "#3498db",
-		DisplayOrder: 2,
-	}
-	status.ID = 2
-
-	data, err := json.Marshal(status)
-	assert.NoError(t, err)
-
-	var result map[string]interface{}
-	err = json.Unmarshal(data, &result)
-	assert.NoError(t, err)
-
-	assert.Equal(t, float64(2), result["id"])
-	assert.Equal(t, "In Progress", result["name"])
-	assert.Equal(t, "Task is being worked on", result["description"])
-	assert.Equal(t, "#3498db", result["color"])
-}
-
 func TestTaskFrequency_JSONSerialization(t *testing.T) {
 	days := 7
 	freq := TaskFrequency{