feat: 后台管理 Admin 仪表盘

新增完整的后台管理系统 (/admin):
- Dashboard: 系统概览、最近采集状态、预测统计
- Collection: 数据采集触发(bzzoiro/understat/injuries)
- Predictions: 预测历史查看、触发新预测
- Backtest: 回测配置与结果查看
- Monitoring: 系统健康、错误日志、死色队列
- Config: API Key 与数据源配置

技术栈: React Router + Tailwind 暗色主题 + TypeScript
文件: 11 个新文件, +21KB JS / +5KB CSS

frontend/src/App.tsx

@@ -1,7 +1,17 @@
+/**
+ * 主应用入口
+ *
+ * 整合前台(报纸风格)和后台(暗色管理)的路由。
+ * - /       → 先知(Profeto)主站
+ * - /admin/* → 管理后台
+ */
+
+import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom'
 import { ErrorBoundary } from './components/ErrorBoundary'
 import Matches from './pages/Matches'
+import { adminRoutes } from './admin/routes'
 
-/** 报眉日期行:2026年9月15日 星期二 */
+/** 报眉日期行 */
 function dateLine(): string {
   return new Date().toLocaleDateString('zh-CN', {
     year: 'numeric',
@@ -11,45 +21,70 @@ function dateLine(): string {
   })
 }
 
+function HomePage() {
+  return (
+    <div className="min-h-screen bg-paper-50">
+      {/* ── 报头:粗线 + 居中刊名 + 报眉 ── */}
+      <header className="masthead-rule">
+        <div className="mx-auto max-w-5xl px-5 sm:px-8">
+          <div className="border-b border-ink-900 py-5 text-center sm:py-6">
+            <h1 className="font-serif text-4xl font-bold tracking-widest text-ink-900">
+              先知
+              <span className="ml-3 align-baseline font-serif text-base font-normal italic tracking-normal text-ink-500">
+                Profeto
+              </span>
+            </h1>
+            <p className="mt-2 text-2xs tracking-[0.4em] text-ink-500">
+              足球比分预测 · 五路专家 · 终裁汇总
+            </p>
+          </div>
+          <div className="flex items-center justify-between border-b border-ink-200 py-2 text-2xs text-ink-500">
+            <span>{dateLine()}</span>
+            <a
+              href="/admin"
+              className="flex items-center gap-1.5 text-press hover:text-press-dark transition-colors"
+            >
+              <span aria-hidden="true">⚙</span>
+              管理后台
+            </a>
+          </div>
+        </div>
+      </header>
+
+      <main className="mx-auto max-w-5xl px-5 py-6 sm:px-8 sm:py-8">
+        <Matches />
+      </main>
+
+      <footer className="mx-auto max-w-5xl px-5 pb-10 sm:px-8">
+        <div className="border-t border-ink-200 pt-3 text-center text-2xs leading-relaxed text-ink-400">
+          预测结果由大语言模型生成 · 仅供研究参考 · 不构成任何投注建议
+        </div>
+      </footer>
+    </div>
+  )
+}
+
 export default function App() {
   return (
     <ErrorBoundary>
-      <div className="min-h-screen bg-paper-50">
-        {/* ── 报头:粗线 + 居中刊名 + 报眉 ── */}
-        <header className="masthead-rule">
-          <div className="mx-auto max-w-5xl px-5 sm:px-8">
-            <div className="border-b border-ink-900 py-5 text-center sm:py-6">
-              <h1 className="font-serif text-4xl font-bold tracking-widest text-ink-900">
-                先知
-                <span className="ml-3 align-baseline font-serif text-base font-normal italic tracking-normal text-ink-500">
-                  Profeto
-                </span>
-              </h1>
-              <p className="mt-2 text-2xs tracking-[0.4em] text-ink-500">
-                足球比分预测 · 五路专家 · 终裁汇总
-              </p>
-            </div>
-            <div className="flex items-center justify-between border-b border-ink-200 py-2 text-2xs text-ink-500">
-              <span>{dateLine()}</span>
-              <span className="flex items-center gap-1.5">
-                <span className="inline-block h-1.5 w-1.5 bg-emerald-600" aria-hidden="true" />
-                服务运行中
-              </span>
-            </div>
-          </div>
-        </header>
-
-        <main className="mx-auto max-w-5xl px-5 py-6 sm:px-8 sm:py-8">
-          <Matches />
-        </main>
-
-        {/* ── 版底 ── */}
-        <footer className="mx-auto max-w-5xl px-5 pb-10 sm:px-8">
-          <div className="border-t border-ink-200 pt-3 text-center text-2xs leading-relaxed text-ink-400">
-            预测结果由大语言模型生成 · 仅供研究参考 · 不构成任何投注建议
-          </div>
-        </footer>
-      </div>
+      <BrowserRouter>
+        <Routes>
+          <Route path="/" element={<HomePage />} />
+          {adminRoutes.map(route => (
+            <Route key={route.path} path={route.path} element={route.element}>
+              {route.children.map(child => (
+                <Route
+                  key={child.path ?? 'index'}
+                  index={child.index}
+                  path={child.path}
+                  element={child.element}
+                />
+              ))}
+            </Route>
+          ))}
+          <Route path="*" element={<Navigate to="/" replace />} />
+        </Routes>
+      </BrowserRouter>
     </ErrorBoundary>
   )
 }