fix: remove dead code duplicates, add SQL LIMIT across all services

- Remove duplicate function definitions with hardcoded "AI-оператор" strings
  (ai_voice_runtime, ai_orchestrator, voice_name_config, voice.py)
- Remove unreachable dead code after return in ai_voice_runtime
- Add SQL LIMIT to 17 unbounded queries across 12 services to prevent OOM
- Move Python-side filtering to SQL WHERE in reporting_service
- Downgrade 19 logger.warning to logger.info for normal-flow events in media_runtime

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

services/supervisor_service/app.py

@@ -188,7 +188,7 @@ def live_calls(
     session = get_session()
     try:
         event_rows = session.execute(
-            select(VoiceEventRow).order_by(VoiceEventRow.id.desc())
+            select(VoiceEventRow).order_by(VoiceEventRow.id.desc()).limit(500)
         ).scalars().all()
         interaction_rows = session.execute(
             select(Interaction).order_by(Interaction.id.desc())