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/webchat_adapter_service/app.py

@@ -111,11 +111,10 @@ def create_message(payload: WebchatMessageIn) -> WebchatMessageOut:
 def list_messages(session_id: str | None = None, limit: int = 100) -> list[WebchatMessageOut]:
     session = get_session()
     try:
-        stmt = select(WebchatMessageRow).order_by(WebchatMessageRow.id.asc())
+        stmt = select(WebchatMessageRow).order_by(WebchatMessageRow.id.desc())
         if session_id:
             stmt = stmt.where(WebchatMessageRow.session_id == session_id)
-        rows = session.execute(stmt).scalars().all()
-        rows = rows[-limit:]
-        return [_to_out(row) for row in rows]
+        rows = session.execute(stmt.limit(max(limit, 1))).scalars().all()
+        return [_to_out(row) for row in reversed(rows)]
     finally:
         session.close()