fix: 修复图片显示问题，添加whitenoise优化静态文件性能

frontend/src/components/competition/CompetitionDetail.jsx

@@ -22,11 +22,10 @@ import 'github-markdown-css/github-markdown-dark.css';
  */
 const getImageUrl = (url) => {
   if (!url) return '';
-  if (url.startsWith('http') || url.startsWith('//')) return url;
-  const apiUrl = import.meta.env.VITE_API_URL || 'http://localhost:8000/api';
-  // Remove /api suffix if present to get the root URL for media files
-  const baseUrl = apiUrl.replace(/\/api\/?$/, '');
-  return `${baseUrl}${url}`;
+  if (url.startsWith('http') || url.startsWith('//')) {
+    try { return new URL(url).pathname; } catch { return url; }
+  }
+  return url;
 };
 
 const { Title, Paragraph } = Typography;

frontend/src/pages/Home.jsx

@@ -3,7 +3,7 @@ import { Card, Row, Col, Tag, Button, Spin, Typography, Carousel } from 'antd';
 import { RocketOutlined, RightOutlined, LeftOutlined } from '@ant-design/icons';
 import { useNavigate } from 'react-router-dom';
 import { motion } from 'framer-motion';
-import { getConfigs, getHomePageConfig, getCompetitions, getActivities } from '../api';
+import { getHomePageConfig, getCompetitions, getActivities } from '../api';
 import './Home.css';
 
 const { Title, Paragraph } = Typography;
@@ -19,7 +19,7 @@ const getImageUrl = (url) => {
 
 const Home = () => {
   const [products, setProducts] = useState([]);
-  const [loading, setLoading] = useState(true);
+  const [loading, setLoading] = useState(false);
   const [typedText, setTypedText] = useState('');
   const [isTypingComplete, setIsTypingComplete] = useState(false);
   const [currentSlide, setCurrentSlide] = useState(0);
@@ -38,7 +38,6 @@ const Home = () => {
   const carouselRef3 = useRef(null);
 
   useEffect(() => {
-    fetchProducts();
     fetchHomePageConfig();
     fetchCompetitions();
     fetchActivities();
@@ -64,17 +63,6 @@ const Home = () => {
     return () => clearInterval(mainTypingInterval);
   }, [homeConfig?.main_title]);
 
-  const fetchProducts = async () => {
-    try {
-      const response = await getConfigs();
-      setProducts(response.data);
-    } catch (error) {
-      console.error('Failed to fetch products:', error);
-    } finally {
-      setLoading(false);
-    }
-  };
-
   const fetchHomePageConfig = async () => {
     try {
       const response = await getHomePageConfig();