refactor(admin): inline bootstrap.tsx into main.tsx

bootstrap.tsx 只有 3 个小函数，不值得单独文件。
合并到 main.tsx：运行时配置加载 + fallback + createRoot 全在一个文件里。

web/src/bootstrap.tsx

@@ -1,39 +0,0 @@
-import {StrictMode, type ReactNode} from 'react';
-import {createRoot} from 'react-dom/client';
-import {QueryClient, QueryClientProvider} from '@tanstack/react-query';
-import dayjs from 'dayjs';
-import 'dayjs/locale/zh-cn';
-import './index.css';
-
-dayjs.locale('zh-cn');
-
-export const renderApplication = (application: ReactNode) => {
-    const queryClient = new QueryClient({
-        defaultOptions: {queries: {refetchOnWindowFocus: false, retry: 1}},
-    });
-    createRoot(document.getElementById('root')!).render(
-        <StrictMode>
-            <QueryClientProvider client={queryClient}>{application}</QueryClientProvider>
-        </StrictMode>,
-    );
-};
-
-export const loadRuntimeConfig = async () => {
-    if (window.PikaRuntime) return;
-    const response = await fetch('/api/config');
-    if (!response.ok) throw new Error('无法加载 Pika 运行时配置');
-    const payload = await response.json();
-    window.PikaRuntime = payload;
-    window.SystemConfig = payload.legacySystemConfig;
-};
-
-export const ensureRuntimeFallback = () => {
-    if (window.SystemConfig) return;
-    window.SystemConfig = {
-        SystemNameZh: '皮卡监控',
-        SystemNameEn: 'Pika Monitor',
-        ICPCode: '',
-        DefaultView: 'grid',
-        Version: '',
-    };
-};

web/src/main.tsx

@@ -1,9 +1,38 @@
+import {StrictMode} from 'react';
+import {createRoot} from 'react-dom/client';
+import {QueryClient, QueryClientProvider} from '@tanstack/react-query';
+import dayjs from 'dayjs';
+import 'dayjs/locale/zh-cn';
 import AdminApp from './App';
-import {ensureRuntimeFallback, loadRuntimeConfig, renderApplication} from './bootstrap';
+import './index.css';
 
-loadRuntimeConfig()
-    .catch((error) => {
-        console.error(error);
-        ensureRuntimeFallback();
+dayjs.locale('zh-cn');
+
+// 异步加载运行时配置，不阻塞渲染
+fetch('/api/config')
+    .then((res) => res.ok ? res.json() : Promise.reject())
+    .then((payload) => {
+        window.PikaRuntime = payload;
+        window.SystemConfig = payload.legacySystemConfig;
     })
-    .finally(() => renderApplication(<AdminApp/>));
+    .catch(() => {
+        window.SystemConfig = {
+            SystemNameZh: '皮卡监控',
+            SystemNameEn: 'Pika Monitor',
+            ICPCode: '',
+            DefaultView: 'grid',
+            Version: '',
+        };
+    })
+    .finally(() => {
+        const queryClient = new QueryClient({
+            defaultOptions: {queries: {refetchOnWindowFocus: false, retry: 1}},
+        });
+        createRoot(document.getElementById('root')!).render(
+            <StrictMode>
+                <QueryClientProvider client={queryClient}>
+                    <AdminApp/>
+                </QueryClientProvider>
+            </StrictMode>,
+        );
+    });