Fix hardcoded localhost:8000 URLs

- Add backend/utils.py for URL management
- Update serializers to use normalize_file_url()
- Update views to use URL utils from env vars
- Fix frontend components to use NEXT_PUBLIC_API_URL
- Add new env vars: DJANGO_BACKEND_URL, DJANGO_MEDIA_BASE_URL
- Replace all hardcoded localhost:8000 with configurable URLs

scripts/quick-check.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+echo "🔍 Быстрая проверка API endpoints"
+echo "=================================="
+
+echo ""
+echo "📊 Docker контейнеры:"
+docker ps --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"
+
+echo ""
+echo "📊 Прослушиваемые порты:"
+netstat -tlnp | grep -E ':(80|443|3000|8000) '
+
+echo ""
+echo "🌐 Проверка основных endpoint:"
+
+echo -n "https://links.shareon.kr/ : "
+curl -s -o /dev/null -w "%{http_code}" "https://links.shareon.kr/" || echo "ERROR"
+
+echo -n "https://links.shareon.kr/admin/ : "
+curl -s -o /dev/null -w "%{http_code}" "https://links.shareon.kr/admin/" || echo "ERROR"
+
+echo -n "https://links.shareon.kr/api/ : "
+curl -s -o /dev/null -w "%{http_code}" "https://links.shareon.kr/api/" || echo "ERROR"
+
+echo -n "http://localhost:8000/api/ : "
+curl -s -o /dev/null -w "%{http_code}" "http://localhost:8000/api/" || echo "ERROR"
+
+echo -n "http://localhost:3000/ : "
+curl -s -o /dev/null -w "%{http_code}" "http://localhost:3000/" || echo "ERROR"
+
+echo ""
+echo "✅ Проверка завершена!"