fix: use nginx port 3000 for CI health check and e2e tests

The backend container only exposes port 8000 internally (expose, not
ports). The health check and Karate tests must go through the nginx
proxy on port 3000, the only port published to the host.

.github/workflows/ci.yml

@@ -106,7 +106,7 @@ jobs:
       - name: Wait for health
         run: |
           for i in $(seq 1 30); do
-            if curl -sf http://localhost:8000/api/health > /dev/null 2>&1; then
+            if curl -sf http://localhost:3000/api/health > /dev/null 2>&1; then
               echo "Backend healthy"
               exit 0
             fi
@@ -123,7 +123,7 @@ jobs:
           if [[ "${{ github.base_ref }}" == release/* ]] || [[ "${{ github.ref }}" == refs/heads/release/* ]]; then
             KARATE_TAGS="@smoke,@regression,@e2e"
           fi
-          mvn test -f e2e/pom.xml -Dkarate.options="--tags ${KARATE_TAGS}"
+          mvn test -f e2e/pom.xml -DbaseUrl=http://localhost:3000 -Dkarate.options="--tags ${KARATE_TAGS}"
 
       - name: Upload Karate reports
         if: always()