chore: remove one-shot ping workflow

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.forgejo/workflows/pricing-model-ping.yml

@@ -1,20 +0,0 @@
-name: Pricing-model Ping
-on:
-  push:
-    branches: [main]
-    paths:
-      - '.forgejo/workflows/pricing-model-ping.yml'
-
-jobs:
-  ping:
-    runs-on: [self-hosted, linux]
-    steps:
-      - name: Telegram
-        env:
-          BOT: ${{ secrets.TELEGRAM_BOT_TOKEN }}
-          CHAT: ${{ secrets.TELEGRAM_CHAT_ID }}
-        run: |
-          curl -sS -X POST "https://api.telegram.org/bot$BOT/sendMessage" \
-            --data-urlencode "chat_id=$CHAT" \
-            --data-urlencode "text=✅ Phase3a pricing model выкатился на стенд (6 коммитов 23d6f2b..23561fc): cost moving-average, эталонная цена, наценки по группам, recalc-retail endpoint, supply override, settings toggles. Можно проверять. → https://food-market.zat.kz" \
-            > /dev/null