feat: add dynamic base URL configuration using environment variables (#1511)

- Replace hardcoded base URL in HttpClient.ts with environment variable support
- Add NEXT_PUBLIC_API_BASE_URL environment variable for dynamic configuration
- Add dev:local script for development with localhost:5300 backend
- Development: uses localhost:5300, Production: uses / (relative path)
- Eliminates need for manual code changes when switching environments

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Junyan Qin <Chin>, 秦骏言 in Chinese, you can call me my english name Rock Chin. <rockchinq@gmail.com>

web/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "scripts": {
     "dev": "next dev --turbopack",
+    "dev:local": "NEXT_PUBLIC_API_BASE_URL=http://localhost:5300 next dev --turbopack",
     "build": "next build",
     "start": "next start",
     "lint": "next lint",

web/src/app/infra/http/HttpClient.ts

@@ -494,9 +494,15 @@ class HttpClient {
   }
 }
 
-// export const httpClient = new HttpClient('https://event-log.langbot.dev');
-// export const httpClient = new HttpClient('http://localhost:5300');
-export const httpClient = new HttpClient('/');
+const getBaseURL = (): string => {
+  if (typeof window !== 'undefined' && process.env.NEXT_PUBLIC_API_BASE_URL) {
+    return process.env.NEXT_PUBLIC_API_BASE_URL;
+  }
+
+  return '/';
+};
+
+export const httpClient = new HttpClient(getBaseURL());
 
 // 临时写法，未来两种Client都继承自HttpClient父类，不允许共享方法
 export const spaceClient = new HttpClient('https://space.langbot.app');