feat: add event watcher

backend/src/userbot/handlers/raw/transcribed.py

@@ -20,3 +20,4 @@ async def handle(
     await repository.set_extracted_text(
         ctx.pool, ctx.account_id, meta.chat_id, update.msg_id, update.text
     )
+    await ctx.watches.on_text(meta.chat_id, update.msg_id, update.text)