feat(ui): add API_TIMEOUT_MS setting to configuration UI

- Add API_TIMEOUT_MS input field to SettingsDialog
- Add translations for the new setting in both English and Chinese locales
- Update ConfigProvider to handle API_TIMEOUT_MS configuration

ui/src/locales/en.json

@@ -30,7 +30,8 @@
     "claude_path": "Claude Path",
     "host": "Host",
     "port": "Port",
-    "apikey": "API Key"
+    "apikey": "API Key",
+    "timeout": "API Timeout (ms)"
   },
   "transformers": {
     "title": "Custom Transformers",