配置 Nginx 反向代理和 Ngrok 内网穿透支持

- 添加 Nginx 反向代理配置（支持 ngrok 域名）
- 创建统一的 API 工具函数（自动适配域名）
- 更新前端 API 配置支持相对路径
- 配置支付宝回调地址使用 ngrok URL
- 优化 Docker Compose 配置（仅暴露 80 端口）
- 添加完整的部署和配置文档

demo/nginx/Dockerfile

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+FROM nginx:alpine
+
+# 复制Nginx配置（覆盖默认配置）
+COPY nginx.conf /etc/nginx/nginx.conf
+
+# 创建必要的目录和日志目录
+RUN mkdir -p /usr/share/nginx/html && \
+    mkdir -p /var/log/nginx && \
+    mkdir -p /var/cache/nginx
+
+# 暴露端口
+EXPOSE 80
+
+# 启动Nginx
+CMD ["nginx", "-g", "daemon off;"]
+

demo/nginx/docker-compose.yml

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+version: '3.8'
+services:
+  nginx:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: aigc-nginx
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro
+      - ../frontend/dist:/usr/share/nginx/html:ro
+      - ./logs:/var/log/nginx
+    networks:
+      - app-network
+    restart: unless-stopped
+    depends_on:
+      - backend
+
+networks:
+  app-network:
+    external: true
+

demo/nginx/nginx.conf

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+user nginx;
+worker_processes auto;
+error_log /var/log/nginx/error.log warn;
+pid /var/run/nginx.pid;
+
+events {
+    worker_connections 1024;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+                    '$status $body_bytes_sent "$http_referer" '
+                    '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log /var/log/nginx/access.log main;
+
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+    keepalive_timeout 65;
+    types_hash_max_size 2048;
+    client_max_body_size 100M;
+
+    # Gzip压缩
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types text/plain text/css text/xml text/javascript 
+               application/json application/javascript application/xml+rss 
+               application/rss+xml font/truetype font/opentype 
+               application/vnd.ms-fontobject image/svg+xml;
+
+    # 上游服务器配置 - Spring Boot 后端
+    upstream backend {
+        server backend:8080;
+        keepalive 32;
+    }
+
+    server {
+        listen 80;
+        server_name localhost curtly-aphorismatic-ginger.ngrok-free.dev;
+
+        # 根目录 - 前端静态文件
+        root /usr/share/nginx/html;
+        index index.html;
+
+        # 前端静态文件
+        location / {
+            try_files $uri $uri/ /index.html;
+            
+            # 静态资源缓存
+            location ~* \.(jpg|jpeg|png|gif|ico|css|js|svg|woff|woff2|ttf|eot)$ {
+                expires 30d;
+                add_header Cache-Control "public, immutable";
+            }
+        }
+
+        # API 代理 - 转发到后端服务
+        location /api/ {
+            proxy_pass http://backend;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection 'upgrade';
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+            proxy_cache_bypass $http_upgrade;
+            
+            # 超时设置
+            proxy_connect_timeout 60s;
+            proxy_send_timeout 60s;
+            proxy_read_timeout 60s;
+            
+            # 请求体大小限制
+            client_max_body_size 100M;
+            
+            # CORS 处理（如果后端未处理）
+            # 允许 ngrok 域名和本地域名
+            add_header Access-Control-Allow-Origin "$http_origin" always;
+            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
+            add_header Access-Control-Allow-Headers "Content-Type, Authorization" always;
+            add_header Access-Control-Allow-Credentials true always;
+            
+            if ($request_method = 'OPTIONS') {
+                return 204;
+            }
+        }
+
+        # WebSocket 支持（如果需要）
+        location /ws/ {
+            proxy_pass http://backend;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        # 健康检查端点
+        location /health {
+            access_log off;
+            return 200 "healthy\n";
+            add_header Content-Type text/plain;
+        }
+
+        # 错误页面
+        error_page 404 /index.html;
+        error_page 500 502 503 504 /50x.html;
+        location = /50x.html {
+            root /usr/share/nginx/html;
+        }
+    }
+}
+