refactor(部署): 重构部署架构，使用本地代理服务器替代环境变量配置

- 删除 Dockerfile.dev 和 entrypoint.sh，简化开发环境配置
- 修改 Dockerfile 使用 node 基础镜像并添加代理服务器
- 新增 proxy-server.js 处理 API 请求代理
- 更新 nginx 配置指向本地代理服务
- 修改前端请求添加自定义 base URL 头支持

proxy-server.js

@@ -0,0 +1,45 @@
+const express = require('express');
+const { createProxyMiddleware } = require('http-proxy-middleware');
+const cors = require('cors');
+
+const app = express();
+const PORT = process.env.PROXY_PORT || 3000;
+
+app.use(cors());
+app.use(express.json());
+
+app.use('/api/chat', createProxyMiddleware({
+  target: 'https://thinkflow.lz-t.top',
+  changeOrigin: true,
+  pathRewrite: {
+    '^/api/chat': '/chat/completions'
+  },
+  onProxyReq: (proxyReq, req, res) => {
+    const customBaseUrl = req.headers['x-custom-base-url'];
+    if (customBaseUrl) {
+      const url = new URL(customBaseUrl);
+      proxyReq.path = url.pathname;
+      proxyReq.setHeader('Host', url.host);
+    }
+  }
+}));
+
+app.use('/api/image', createProxyMiddleware({
+  target: 'https://thinkflow.lz-t.top',
+  changeOrigin: true,
+  pathRewrite: {
+    '^/api/image': '/images/generations'
+  },
+  onProxyReq: (proxyReq, req, res) => {
+    const customBaseUrl = req.headers['x-custom-base-url'];
+    if (customBaseUrl) {
+      const url = new URL(customBaseUrl);
+      proxyReq.path = url.pathname;
+      proxyReq.setHeader('Host', url.host);
+    }
+  }
+}));
+
+app.listen(PORT, () => {
+  console.log(`Proxy server running on port ${PORT}`);
+});