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/handlers/task_handler_test.go

@@ -610,7 +610,6 @@ func TestTaskHandler_GetLookups(t *testing.T) {
 	authGroup.Use(testutil.MockAuthMiddleware(user))
 	authGroup.GET("/categories/", handler.GetCategories)
 	authGroup.GET("/priorities/", handler.GetPriorities)
-	authGroup.GET("/statuses/", handler.GetStatuses)
 	authGroup.GET("/frequencies/", handler.GetFrequencies)
 
 	t.Run("get categories", func(t *testing.T) {
@@ -642,18 +641,6 @@ func TestTaskHandler_GetLookups(t *testing.T) {
 		assert.Contains(t, response[0], "level")
 	})
 
-	t.Run("get statuses", func(t *testing.T) {
-		w := testutil.MakeRequest(router, "GET", "/api/tasks/statuses/", nil, "test-token")
-
-		testutil.AssertStatusCode(t, w, http.StatusOK)
-
-		var response []map[string]interface{}
-		err := json.Unmarshal(w.Body.Bytes(), &response)
-		require.NoError(t, err)
-
-		assert.Greater(t, len(response), 0)
-	})
-
 	t.Run("get frequencies", func(t *testing.T) {
 		w := testutil.MakeRequest(router, "GET", "/api/tasks/frequencies/", nil, "test-token")