fix: set account_id on session_supporting_data, session_resolution_outputs, maintenance_schedules, psa_post_log constructors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/resolution_output_generator.py

@@ -45,6 +45,7 @@ class ResolutionOutputGenerator:
 
             output = SessionResolutionOutput(
                 session_id=session_id,
+                account_id=session.account_id,
                 output_type=output_type,
                 generated_content=content,
                 status="draft",