ci: simplify deploy workflow - frontend now builds in Docker

Removed npm ci/build step from workflow since the Dockerfile now
handles the full frontend build. Increased health check timeout to 180s.

🤖 Generated with [Amplifier](https://github.com/microsoft/amplifier)

Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

.gitea/workflows/deploy.yml

@@ -13,18 +13,10 @@ jobs:
         run: |
           git pull origin main
 
-      - name: Build frontend
-        working-directory: /home/ken/workspace/research-workbench/frontend
-        run: |
-          npm ci
-          npm run build
-
       - name: Stop old containers
         working-directory: /home/ken/workspace/research-workbench
         run: |
-          # Stop the old car-help container if still running
           docker rm -f car-help 2>/dev/null || true
-          # Stop any existing workbench container
           docker compose down 2>/dev/null || true
 
       - name: Build and start container
@@ -39,14 +31,14 @@ jobs:
       - name: Wait for healthy
         run: |
           echo "Waiting for container to start..."
-          for i in $(seq 1 60); do
+          for i in $(seq 1 90); do
             if curl -sf http://localhost:8080/ > /dev/null 2>&1; then
               echo "App is up at http://localhost:8080/"
               exit 0
             fi
             sleep 2
           done
-          echo "ERROR: App did not respond within 120s"
+          echo "ERROR: App did not respond within 180s"
           docker compose -f /home/ken/workspace/research-workbench/docker-compose.yml logs --tail=50
           exit 1