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/Reference/SeedKeywords.tsx

@@ -87,7 +87,7 @@ export default function SeedKeywords() {
                   <th className="text-left py-3 px-4 text-sm font-medium text-gray-700 dark:text-gray-300">Sector</th>
                   <th className="text-left py-3 px-4 text-sm font-medium text-gray-700 dark:text-gray-300">Volume</th>
                   <th className="text-left py-3 px-4 text-sm font-medium text-gray-700 dark:text-gray-300">Difficulty</th>
-                  <th className="text-left py-3 px-4 text-sm font-medium text-gray-700 dark:text-gray-300">Intent</th>
+                  <th className="text-left py-3 px-4 text-sm font-medium text-gray-700 dark:text-gray-300">Country</th>
                 </tr>
               </thead>
               <tbody>
@@ -109,7 +109,7 @@ export default function SeedKeywords() {
                       {keyword.difficulty}
                     </td>
                     <td className="py-3 px-4">
-                      <Badge variant="light" color="primary">{keyword.intent_display}</Badge>
+                      <Badge variant="light" color="info">{keyword.country_display}</Badge>
                     </td>
                   </tr>
                 ))}