Implement Stage 3: Enhance content metadata and validation features

- Added entity metadata fields to the Tasks model, including entity_type, taxonomy, and cluster_role.
- Updated CandidateEngine to prioritize content relevance based on cluster mappings.
- Introduced metadata completeness scoring in ContentAnalyzer.
- Enhanced validation services to check for entity type and mapping completeness.
- Updated frontend components to display and validate new metadata fields.
- Implemented API endpoints for content validation and metadata persistence.
- Migrated existing data to populate new metadata fields for Tasks and Content.

backend/igny8_core/modules/billing/migrations/0003_fix_tenant_id_column.py

@@ -0,0 +1,22 @@
+# Generated migration to fix tenant_id column name
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('billing', '0002_rename_tenant_to_account'),
+    ]
+
+    operations = [
+        # Rename the database column from account_id to tenant_id to match model's db_column
+        migrations.RunSQL(
+            sql="ALTER TABLE igny8_credit_transactions RENAME COLUMN account_id TO tenant_id;",
+            reverse_sql="ALTER TABLE igny8_credit_transactions RENAME COLUMN tenant_id TO account_id;"
+        ),
+        migrations.RunSQL(
+            sql="ALTER TABLE igny8_credit_usage_logs RENAME COLUMN account_id TO tenant_id;",
+            reverse_sql="ALTER TABLE igny8_credit_usage_logs RENAME COLUMN tenant_id TO account_id;"
+        ),
+    ]
+