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/auth/migrations/0018_add_country_remove_intent_seedkeyword.py

@@ -0,0 +1,30 @@
+# Generated by Django 5.2.9 on 2025-12-17 06:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('igny8_core_auth', '0017_add_history_tracking'),
+    ]
+
+    operations = [
+        migrations.RemoveIndex(
+            model_name='seedkeyword',
+            name='igny8_seed__intent_15020d_idx',
+        ),
+        migrations.RemoveField(
+            model_name='seedkeyword',
+            name='intent',
+        ),
+        migrations.AddField(
+            model_name='seedkeyword',
+            name='country',
+            field=models.CharField(choices=[('US', 'United States'), ('CA', 'Canada'), ('GB', 'United Kingdom'), ('AE', 'United Arab Emirates'), ('AU', 'Australia'), ('IN', 'India'), ('PK', 'Pakistan')], default='US', help_text='Target country for this keyword', max_length=2),
+        ),
+        migrations.AddIndex(
+            model_name='seedkeyword',
+            index=models.Index(fields=['country'], name='igny8_seed__country_4127a5_idx'),
+        ),
+    ]