Fix catch-all route serving HTML for API requests

[Copilot]

The catch-all route app.get('*', ...) was matching /api/env.js and other API endpoints, serving index.html instead of route handlers. Browsers received HTML when expecting JavaScript, causing SyntaxError: Unexpected token '<'.

Changes

• Added path check to catch-all route to skip /api/* requests, allowing them to reach registered handlers or error middleware

app.get('*', (req, res, next) => {
  // Don't serve index.html for API routes
  if (req.path.startsWith('/api/')) {
    return next();
  }
  // ... serve index.html for SPA routes
});

This preserves SPA routing for frontend paths while ensuring API routes return proper JSON/JavaScript responses.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>最新版 docker 镜像，访问首页加载 env.js 报错，导致页面空白</issue_title>
<issue_description>### Qinglong version

2.20.0

Steps to reproduce

Docker arm64 拉取最新镜像，访问页面空白，查看是前端 JS 加载报错

What is expected?

正在进入登陆页面

What is actually happening?

页面空白，无法加载

System Info

 chrome 143.0.7499.41

Any additional comments?

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

@whyour 贴个图吧 @whyour docker 容器启动成功了吗

• Fixes 最新版 docker 镜像，访问首页加载 env.js 报错，导致页面空白 #2859

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Project	Deployment	Review	Updated (UTC)
qinglong	Ready	Preview, Comment	Dec 24, 2025 8:45am
qinglong-back	Ready	Preview, Comment	Dec 24, 2025 8:45am