feat: Implement Vercel environment detection and pause settings auto-fetch after consecutive failures to prevent excessive API calls.

webui/src/utils/runtimeEnv.js

@@ -0,0 +1,13 @@
+export function detectRuntimeEnv() {
+    const deployTarget = String(import.meta.env.VITE_DEPLOY_TARGET || '').trim().toLowerCase()
+    if (deployTarget === 'vercel') {
+        return { isVercel: true, source: 'vite_env' }
+    }
+
+    const host = typeof window !== 'undefined' ? String(window.location.hostname || '').toLowerCase() : ''
+    if (host.includes('vercel.app')) {
+        return { isVercel: true, source: 'hostname' }
+    }
+
+    return { isVercel: false, source: 'default' }
+}