fix: Correction dépendances circulaires

Back-End/Common/admin.py

@@ -0,0 +1,3 @@
+from django.contrib import admin
+
+# Register your models here.

Back-End/Common/apps.py

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+from django.apps import AppConfig
+
+
+class CommonConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'Common'

Back-End/Common/models.py

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+from django.db import models
+
+class StudentCompetency(models.Model):
+    student = models.ForeignKey('Subscriptions.Student', on_delete=models.CASCADE, related_name='competency_scores')
+    competency = models.ForeignKey('School.Competency', on_delete=models.CASCADE, related_name='student_scores')
+    score = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True)
+    comment = models.TextField(blank=True, null=True)
+
+    class Meta:
+        unique_together = ('student', 'competency')
+
+    def __str__(self):
+        return f"{self.student} - {self.competency.name} - Score: {self.score}"

Back-End/Common/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

Back-End/Common/views.py

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+from django.shortcuts import render
+
+# Create your views here.