[chore] Global project refactoring

backend/project/api/core/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class CoreConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "core"

backend/project/api/core/models.py

@@ -0,0 +1,14 @@
+from django.db import models
+
+
+class AbstractTag(models.Model):
+    name = models.CharField(
+        max_length=255,
+        unique=True,
+    )
+
+    class Meta:
+        abstract = True
+
+    def __str__(self):
+        return self.name