fix(config): 生产构建(Tauri打包)默认回退生产 opc.pinesound.cn + 启动地址诊断日志

- resolveHost：生产构建且运行于 Tauri WebView 时默认回退 opc.pinesound.cn（不再回退局域网 192.168.1.9），
  即使 config.json / .env 缺失也能接入生产；本地 dev 仍回退局域网
- main.jsx：bootstrap 后打印最终生效 API_BASE / MQTT_URL / MQTT_USER，便于定位地址切换问题
- 已验证构建产物：烘焙 https://opc.pinesound.cn/park，无 192.168.1.9:8090 / 192.168.1.3:8083 残留

src/main.jsx

@@ -5,7 +5,7 @@ import BindScreen from "./components/BindScreen.jsx";
 import { isDeviceBound } from "./utils/tenant";
 import ErrorBoundary from "./components/ErrorBoundary";
 import { ThemeProvider } from "@appica/ui-react/providers/theme-provider";
-import { getApiBase } from "./config";
+import { getApiBase, getMqttUrl, getMqttCredentials } from "./config";
 import { invoke } from "@tauri-apps/api/core";
 import "./styles/global.css";
 
@@ -80,6 +80,10 @@ async function bootstrapRuntimeConfig() {
 }
 
 bootstrapRuntimeConfig().then(() => {
+  // 启动诊断：打印最终生效的 API / MQTT 地址（config.json > 构建烘焙 > /api/config 下发 > 内置默认）
+  try {
+    console.info(`[bootstrap] API_BASE=${getApiBase()} MQTT_URL=${getMqttUrl()} MQTT_USER=${getMqttCredentials().username || "(空)"}`);
+  } catch (e) { /* 忽略 */ }
   ReactDOM.createRoot(document.getElementById("root")).render(
     <React.StrictMode>
       <ErrorBoundary>