Revert "Add version control system functionality with branch management, history tracking, and merge operations"

This reverts commit 939eaed201.

media/admin.py

@@ -1,28 +1,19 @@
 from django.contrib import admin
-from django.contrib.contenttypes.admin import GenericStackedInline
+from django.utils.html import format_html
 from .models import Photo
 
-class PhotoInline(GenericStackedInline):
-    """Inline admin for photos that can be added to any model."""
-    model = Photo
-    extra = 1
-    fields = ('image', 'caption', 'alt_text', 'is_primary')
-    classes = ('collapse',)
-    
 @admin.register(Photo)
 class PhotoAdmin(admin.ModelAdmin):
-    list_display = ('caption', 'content_type', 'object_id', 'is_primary', 'created_at')
-    list_filter = ('content_type', 'created_at', 'is_primary', 'is_approved')
+    list_display = ('thumbnail_preview', 'content_type', 'content_object', 'caption', 'is_primary', 'created_at')
+    list_filter = ('content_type', 'is_primary', 'created_at')
     search_fields = ('caption', 'alt_text')
-    ordering = ('content_type', 'object_id', '-is_primary')
-    readonly_fields = ('created_at', 'updated_at')
+    readonly_fields = ('thumbnail_preview',)
     
-    fieldsets = (
-        ('Image', {
-            'fields': ('image', 'caption', 'alt_text', 'is_primary', 'is_approved')
-        }),
-        ('Metadata', {
-            'fields': ('content_type', 'object_id', 'created_at', 'updated_at'),
-            'classes': ('collapse',)
-        }),
-    )
+    def thumbnail_preview(self, obj):
+        if obj.image:
+            return format_html(
+                '<img src="{}" style="max-height: 50px; max-width: 100px;" />',
+                obj.image.url
+            )
+        return "No image"
+    thumbnail_preview.short_description = 'Thumbnail'

media/mixins.py

@@ -1,19 +0,0 @@
-from django.contrib.contenttypes.models import ContentType
-from django.db.models import QuerySet
-
-class PhotoableModel:
-    """Mixin for models that can have photos attached."""
-
-    def get_photos(self) -> QuerySet:
-        """Get photos for this instance."""
-        from media.models import Photo
-        ct = ContentType.objects.get_for_model(self.__class__)
-        return Photo.objects.filter(content_type=ct, object_id=self.pk)
-
-    def add_photo(self, photo: 'Photo') -> None:
-        """Add a photo to this instance."""
-        from media.models import Photo
-        ct = ContentType.objects.get_for_model(self.__class__)
-        photo.content_type = ct
-        photo.object_id = self.pk
-        photo.save()