fix(ci): use Vercel CLI directly for deploys, disable Git auto-deploy

Replace amondnet/vercel-action@v25 (bundles ancient Vercel CLI 25.1.0)
with latest vercel CLI + --archive=tgz to avoid free-tier upload rate
limits. Disable Vercel Git integration auto-deploy to prevent duplicate
deployments — GitHub Actions is the sole deploy mechanism.

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

Author: catomean

.github/workflows/deploy.yml

@@ -34,30 +34,20 @@ jobs:
       - name: Run tests
         run: npm run test --if-present
 
-      - name: Deploy to Vercel (Preview)
-        if: github.event_name == 'pull_request'
-        uses: amondnet/vercel-action@v25
-        with:
-          vercel-token: ${{ secrets.VERCEL_TOKEN }}
-          vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}
-          vercel-project-id: ${{ secrets.VERCEL_PROJECT_ID }}
-          vercel-args: '--prod=false'
-          working-directory: ./
-          alias-domains: |-
-            pr-{{ pr-number }}.${{ secrets.VERCEL_TEAM_URL }}
+      - name: Install Vercel CLI
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: npm install -g vercel@latest
 
       - name: Deploy to Vercel (Production)
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-        uses: amondnet/vercel-action@v25
-        with:
-          vercel-token: ${{ secrets.VERCEL_TOKEN }}
-          vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}
-          vercel-project-id: ${{ secrets.VERCEL_PROJECT_ID }}
-          vercel-args: '--prod=true'
-          working-directory: ./
+        run: vercel deploy --prod --archive=tgz --yes --token=${{ secrets.VERCEL_TOKEN }}
+        env:
+          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
 
-      - name: Health Check
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-        run: |
-          echo "Deployment completed successfully"
-          echo "Site will be available at: https://${{ secrets.VERCEL_TEAM_URL }}"
+      - name: Deploy to Vercel (Preview)
+        if: github.event_name == 'pull_request'
+        run: vercel deploy --archive=tgz --yes --token=${{ secrets.VERCEL_TOKEN }}
+        env:
+          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
+          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}

vercel.json

@@ -2,6 +2,9 @@
   "buildCommand": "next build",
   "devCommand": "next dev",
   "framework": "nextjs",
+  "github": {
+    "enabled": false
+  },
   "crons": [
     {
       "path": "/api/rebuild",