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/models.py

@@ -131,9 +131,9 @@ class Keywords(SoftDeletableModel, SiteSectorBaseModel):
         return self.difficulty_override if self.difficulty_override is not None else (self.seed_keyword.difficulty if self.seed_keyword else 0)
     
     @property
-    def intent(self):
-        """Get intent from seed_keyword"""
-        return self.seed_keyword.intent if self.seed_keyword else 'informational'
+    def country(self):
+        """Get country from seed_keyword"""
+        return self.seed_keyword.country if self.seed_keyword else 'US'
     
     def save(self, *args, **kwargs):
         """Validate that seed_keyword's industry/sector matches site's industry/sector"""