fix: pass Vite env vars as Docker build args

Vite reads env vars at build time, not runtime. The previous setup
only set them in docker-compose 'environment' which is only available
at container runtime. Now they are passed as build args so Vite can
embed the correct API URL during the build process.

- Add build args to web service in both compose files
- Update Dockerfile to accept ARGs and set ENV for Vite
- Fixes login redirect always going to localhost:8000

apps/web/Dockerfile

@@ -12,6 +12,12 @@ RUN npm install
 # Copy source code
 COPY . .
 
+# Accept build arguments for API and app URLs
+ARG VITE_API_BASE_URL
+ARG VITE_APP_URL
+ENV VITE_API_BASE_URL=${VITE_API_BASE_URL}
+ENV VITE_APP_URL=${VITE_APP_URL}
+
 # Build production bundle
 RUN npm run build