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.

frontend/src/pages/Planner/Dashboard.tsx

@@ -39,7 +39,7 @@ interface DashboardStats {
     mapped: number;
     unmapped: number;
     byStatus: Record<string, number>;
-    byIntent: Record<string, number>;
+    byCountry: Record<string, number>;
   };
   clusters: {
     total: number;
@@ -90,11 +90,11 @@ export default function PlannerDashboard() {
       const unmappedKeywords = keywords.filter(k => !k.cluster || k.cluster.length === 0);
       
       const keywordsByStatus: Record<string, number> = {};
-      const keywordsByIntent: Record<string, number> = {};
+      const keywordsByCountry: Record<string, number> = {};
       keywords.forEach(k => {
         keywordsByStatus[k.status || 'unknown'] = (keywordsByStatus[k.status || 'unknown'] || 0) + 1;
-        if (k.intent) {
-          keywordsByIntent[k.intent] = (keywordsByIntent[k.intent] || 0) + 1;
+        if (k.country) {
+          keywordsByCountry[k.country] = (keywordsByCountry[k.country] || 0) + 1;
         }
       });
 
@@ -135,7 +135,7 @@ export default function PlannerDashboard() {
           mapped: mappedKeywords.length,
           unmapped: unmappedKeywords.length,
           byStatus: keywordsByStatus,
-          byIntent: keywordsByIntent
+          byCountry: keywordsByCountry
         },
         clusters: {
           total: clusters.length,