Add Linker and Optimizer modules with API integration and frontend components

- Added Linker and Optimizer apps to `INSTALLED_APPS` in `settings.py`.
- Configured API endpoints for Linker and Optimizer in `urls.py`.
- Implemented `OptimizeContentFunction` for content optimization in the AI module.
- Created prompts for content optimization and site structure generation.
- Updated `OptimizerService` to utilize the new AI function for content optimization.
- Developed frontend components including dashboards and content lists for Linker and Optimizer.
- Integrated new routes and sidebar navigation for Linker and Optimizer in the frontend.
- Enhanced content management with source and sync status filters in the Writer module.
- Comprehensive test coverage added for new features and components.

backend/igny8_core/modules/optimizer/serializers.py

@@ -0,0 +1,74 @@
+from rest_framework import serializers
+from igny8_core.business.content.models import Content
+from igny8_core.business.optimization.models import OptimizationTask
+
+
+class OptimizeContentSerializer(serializers.Serializer):
+    """Serializer for optimizing content"""
+    content_id = serializers.IntegerField(required=True)
+    entry_point = serializers.ChoiceField(
+        choices=['auto', 'writer', 'wordpress', 'external', 'manual'],
+        default='auto',
+        required=False
+    )
+    
+    def validate_content_id(self, value):
+        try:
+            content = Content.objects.get(id=value)
+            account = self.context['request'].user.account if hasattr(self.context['request'].user, 'account') else None
+            if account and content.account != account:
+                raise serializers.ValidationError("Content not found or access denied")
+            return value
+        except Content.DoesNotExist:
+            raise serializers.ValidationError("Content not found")
+
+
+class BatchOptimizeContentSerializer(serializers.Serializer):
+    """Serializer for batch optimization"""
+    content_ids = serializers.ListField(
+        child=serializers.IntegerField(),
+        min_length=1,
+        max_length=20
+    )
+    entry_point = serializers.ChoiceField(
+        choices=['auto', 'writer', 'wordpress', 'external', 'manual'],
+        default='auto',
+        required=False
+    )
+
+
+class OptimizationResultSerializer(serializers.ModelSerializer):
+    """Serializer for optimization results"""
+    content_title = serializers.CharField(source='content.title', read_only=True)
+    content_id = serializers.IntegerField(source='content.id', read_only=True)
+    
+    class Meta:
+        model = OptimizationTask
+        fields = [
+            'id',
+            'content_id',
+            'content_title',
+            'scores_before',
+            'scores_after',
+            'status',
+            'credits_used',
+            'created_at',
+            'updated_at',
+        ]
+        read_only_fields = fields
+
+
+class AnalyzeContentSerializer(serializers.Serializer):
+    """Serializer for content analysis (preview only)"""
+    content_id = serializers.IntegerField(required=True)
+    
+    def validate_content_id(self, value):
+        try:
+            content = Content.objects.get(id=value)
+            account = self.context['request'].user.account if hasattr(self.context['request'].user, 'account') else None
+            if account and content.account != account:
+                raise serializers.ValidationError("Content not found or access denied")
+            return value
+        except Content.DoesNotExist:
+            raise serializers.ValidationError("Content not found")
+