ci: add PR quality and coverage gates

backend/math_life/management/commands/seed_initial_content.py

@@ -17,7 +17,6 @@ from math_life.models import (
 )
 from math_life.services import validate_story_content
 
-
 DISCIPLINE_ICONS = {
     "人工智能": "🤖",
     "计算机": "💻",

backend/math_life/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.

backend/math_life/urls.py

@@ -9,7 +9,6 @@ from .views import (
     StoryStartView,
 )
 
-
 urlpatterns = [
     path("mathbti/", MathBTIAssessmentView.as_view(), name="mathbti-assessment"),
     path("mathbti/submit/", MathBTISubmitView.as_view(), name="mathbti-submit"),