feat(docker-compose.yml): add VITE_PROXY_TARGET environment variable to frontend service

feat(frontend/dev.Dockerfile): change npm start command to npm run dev:docker
feat(frontend/package.json): add dev:docker script to run vite with host 0.0.0.0
feat(frontend/vite.config.ts): use environment variable to determine the target for proxying requests

src/frontend/package.json

@@ -35,6 +35,7 @@
         "web-vitals": "^2.1.4"
     },
     "scripts": {
+        "dev:docker": "vite --host 0.0.0.0",
         "start": "vite",
         "build": "vite build",
         "serve": "vite preview"
@@ -76,4 +77,4 @@
         "typescript": "^5.0.2",
         "vite": "^4.3.5"
     }
-}
+}