Update ping URL to correct Healthchecks.io endpoint

https://claude.ai/code/session_01U8j5zqsX4kwqjnzq3EncSi

.github/workflows/ping.yml

@@ -1,37 +0,0 @@
-name: Health Check Ping
-
-on:
-  schedule:
-    - cron: "*/10 * * * *"
-  workflow_dispatch:
-
-jobs:
-  ping:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Ping 1
-        run: curl -fsS --retry 3 https://hello-world-3o95ks7si-our-claude-s-projects.vercel.app/api/ping
-
-      - name: Wait 2 min
-        run: sleep 120
-
-      - name: Ping 2
-        run: curl -fsS --retry 3 https://hello-world-3o95ks7si-our-claude-s-projects.vercel.app/api/ping
-
-      - name: Wait 2 min
-        run: sleep 120
-
-      - name: Ping 3
-        run: curl -fsS --retry 3 https://hello-world-3o95ks7si-our-claude-s-projects.vercel.app/api/ping
-
-      - name: Wait 2 min
-        run: sleep 120
-
-      - name: Ping 4
-        run: curl -fsS --retry 3 https://hello-world-3o95ks7si-our-claude-s-projects.vercel.app/api/ping
-
-      - name: Wait 2 min
-        run: sleep 120
-
-      - name: Ping 5
-        run: curl -fsS --retry 3 https://hello-world-3o95ks7si-our-claude-s-projects.vercel.app/api/ping