Refactor keyword handling: Replace 'intent' with 'country' across backend and frontend

- Updated AutomationService to include estimated_word_count.
- Increased stage_1_batch_size from 20 to 50 in AutomationViewSet.
- Changed Keywords model to replace 'intent' property with 'country'.
- Adjusted ClusteringService to allow a maximum of 50 keywords for clustering.
- Modified admin and management commands to remove 'intent' and use 'country' instead.
- Updated serializers to reflect the change from 'intent' to 'country'.
- Adjusted views and filters to use 'country' instead of 'intent'.
- Updated frontend forms, filters, and pages to replace 'intent' with 'country'.
- Added migration to remove 'intent' field and add 'country' field to SeedKeyword model.

backend/igny8_core/business/planning/services/clustering_service.py

@@ -38,10 +38,10 @@ class ClusteringService:
                 'error': 'No keyword IDs provided'
             }
         
-        if len(keyword_ids) > 20:
+        if len(keyword_ids) > 50:
             return {
                 'success': False,
-                'error': 'Maximum 20 keywords allowed for clustering'
+                'error': 'Maximum 50 keywords allowed for clustering'
             }
         
         # Check credits (fixed cost per clustering operation)