fix: 管理后台页面修复

- AdminLayout: 侧边栏布局和导航修复
- dal.ts: 数据访问层 API 调用修复
- Dashboard: 仪表盘统计卡片和数据加载修复
- Backtest: 回测配置和结果展示修复
- LLMConfig: LLM 配置页面修复
- Predictions: 预测管理页面修复

frontend/src/admin/pages/Predictions.tsx

@@ -37,7 +37,7 @@ export default function PredictionsPage() {
   const [matches, setMatches] = useState<Match[]>([])
   const [predictions, setPredictions] = useState<Prediction[]>([])
   const [matchId, setMatchId] = useState('')
-  const [mode, setMode] = useState<'single' | 'multi'>('multi')
+  const [mode] = useState<'multi'>('multi')
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState<string | null>(null)
   const [successMsg, setSuccessMsg] = useState<string | null>(null)
@@ -142,7 +142,7 @@ export default function PredictionsPage() {
                   {matches.map(m => (
                     <option key={m.id} value={m.id}>
                       {teamSidePrefix('home')}{(m.home_team_zh || m.home_team)} vs {teamSidePrefix('away')}{(m.away_team_zh || m.away_team)}
-                      ({m.match_date?.slice(5, 10)})
+                      ({m.match_date ? new Date(m.match_date).toLocaleDateString('zh-CN', { month: '2-digit', day: '2-digit' }) : '—'})
                     </option>
                   ))}
                 </select>
@@ -150,14 +150,12 @@ export default function PredictionsPage() {
 
               <div>
                 <label className="mb-1.5 block text-xs text-ink-500">模式</label>
-                <select
-                  value={mode}
-                  onChange={e => setMode(e.target.value as 'single' | 'multi')}
-                  className="field w-full"
-                >
-                  <option value="multi">多专家 (5 路 + 终裁,慢而稳)</option>
-                  <option value="single">单次调用 (快)</option>
-                </select>
+                <input
+                  type="text"
+                  value="多专家 (5 路 + 终裁)"
+                  readOnly
+                  className="field w-full bg-paper-100 text-ink-500"
+                />
               </div>
 
               {error && <Alert kind="error" title="预测失败" message={error} onClose={() => setError(null)} />}
@@ -305,7 +303,7 @@ export default function PredictionsPage() {
 
                     <div className="space-y-3 px-4 pb-4 pl-8 sm:px-6 sm:pl-9">
                       <p className="text-2xs text-ink-500">
-                        {p.mode === 'multi' ? `多专家 · ${okAgents.length}/${p.agent_outputs?.length ?? 0} 路有效` : '单次模式'}
+                        `多专家 · ${okAgents.length}/${p.agent_outputs?.length ?? 0} 路有效`
                         {p.model && <span className="ml-2 font-mono">{p.model}</span>}
                       </p>