fix(deploy): pass NEXT_PUBLIC_API_URL build arg to web Docker build

Without this, the Next.js bundle defaults to http://localhost:4000
which doesn't resolve from the user's browser, causing projects
to silently fail to load.

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

Author: mechramc

.github/workflows/deploy.yml

@@ -100,6 +100,8 @@ jobs:
           context: .
           file: apps/web/Dockerfile
           push: true
+          build-args: |
+            NEXT_PUBLIC_API_URL=https://blueflame-api-dev.blackfield-ff30bbff.centralus.azurecontainerapps.io
           tags: |
             ${{ env.WEB_IMAGE }}:${{ github.sha }}
             ${{ env.WEB_IMAGE }}:latest