chore: fix replay when self host

[fengju0213]

🐞 Root Cause

The local Electron app always overwrote SERVER_URL when spawning the backend,
forcing it to: https://dev.eigent.ai/api

As a result:

• Step events were synced to the cloud instead of the local server
• The local server had no step data
• Local replay got stuck with no steps to replay

---

✅ Fix

Updated the Electron backend launcher to:

• Read SERVER_URL from ~/.eigent/.env or existing environment variables
• Only fall back to the cloud URL if SERVER_URL is not provided

After restarting the app and running a new task:

• Step events are stored locally
• Local replay works as expected

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[Wendong-Fan]

Nice fix! The root cause analysis is solid and the multi-source resolution approach makes sense. Left a few inline comments on edge cases that could bite us in production.

[Wendong-Fan]

Small inconsistency here: l.trim() is used for the empty/comment checks, but l.startsWith(...) runs on the raw (untrimmed) line. So if someone has a leading space like SERVER_URL=xxx in their .env, the trim checks pass but the key match fails silently.

Suggestion: store l.trim() in a variable and use it for all checks:

const line = lines.find((l) => {
    const trimmed = l.trim();
    return trimmed && !trimmed.startsWith('#') && trimmed.startsWith(`${key}=`);
});

[Wendong-Fan]

This will break if the .env value is quoted, e.g. SERVER_URL="https://my-server.com/api". The returned value would include the surrounding quotes, making the URL invalid.

Worth adding a strip for single/double quotes after the trim:

let value = line.trim().slice(key.length + 1).trim();
if ((value.startsWith('"') && value.endsWith('"')) ||
    (value.startsWith("'") && value.endsWith("'"))) {
    value = value.slice(1, -1);
}
return value;

(Also note: since we changed to matching on trimmed, need line.trim().slice(...) here too.)

[Wendong-Fan]

If someone already has /api in their proxy URL (e.g. VITE_PROXY_URL=http://localhost:8000/api), this would produce http://localhost:8000/api/api.

Quick guard before appending:

if (trimmed.endsWith('/api')) return trimmed;
return `${trimmed}/api`;

[Wendong-Fan]

process.cwd() is unreliable in packaged Electron apps. It varies depending on how the user launched the app (Finder, terminal, Spotlight, etc.). Since this block only runs when VITE_DEV_SERVER_URL is set (i.e. during dev), app.getAppPath() would be a safer choice here and still point to the project root.

[Wendong-Fan]

added commit 67e42f5

[fengju0213]

thanks! @Wendong-Fan