feat: Implement initial backend API server with various endpoints and background services, including an error account cleaner.

backend/cmd/main.go

@@ -508,7 +508,7 @@ func handleS2ATest(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// 请求 S2A 仪表盘接口
-	dashboardURL := config.Global.S2AApiBase + "/api/v1/admin/dashboard"
+	dashboardURL := config.Global.S2AApiBase + "/api/v1/admin/dashboard/stats"
 	req, err := http.NewRequest("GET", dashboardURL, nil)
 	if err != nil {
 		api.Error(w, http.StatusInternalServerError, "创建请求失败")

backend/internal/api/error_cleaner.go

@@ -75,7 +75,7 @@ func getTotalAccountCount() (int, error) {
 	}
 
 	client := &http.Client{Timeout: 30 * time.Second}
-	url := fmt.Sprintf("%s/api/v1/admin/dashboard", config.Global.S2AApiBase)
+	url := fmt.Sprintf("%s/api/v1/admin/dashboard/stats", config.Global.S2AApiBase)
 
 	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {

frontend/src/components/dashboard/PoolStatus.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react'
-import { Users, CheckCircle, XCircle, AlertTriangle, Zap, Activity, TrendingUp } from 'lucide-react'
+import { Users, CheckCircle, XCircle, AlertTriangle, Zap, Activity } from 'lucide-react'
 import type { DashboardStats } from '../../types'
 import StatsCard from './StatsCard'
 
@@ -78,17 +78,15 @@ export default function PoolStatus({ stats, loading, error }: PoolStatusProps) {
         color="slate"
         loading={loading}
       />
-      {/* RPM 卡片 - 显示当前 RPM 和今日最高 */}
-      <div className="relative">
-        <StatsCard title="RPM" value={stats?.rpm ?? 0} icon={Zap} color="blue" loading={loading} />
-        {/* 今日最高 RPM 显示在卡片下方 */}
-        {maxRpm > 0 && (
-          <div className="absolute -bottom-5 left-0 right-0 flex items-center justify-center gap-1 text-xs text-slate-500 dark:text-slate-400">
-            <TrendingUp className="h-3 w-3 text-orange-500" />
-            <span>今日最高: <span className="font-semibold text-orange-500">{maxRpm}</span></span>
-          </div>
-        )}
-      </div>
+      <StatsCard
+        title="RPM"
+        value={stats?.rpm ?? 0}
+        icon={Zap}
+        color="blue"
+        loading={loading}
+        subtitle={maxRpm > 0 ? `📈 今日最高: ${maxRpm}` : undefined}
+      />
     </div>
   )
 }
+

frontend/src/components/dashboard/StatsCard.tsx

@@ -10,6 +10,8 @@ interface StatsCardProps {
   trendValue?: string
   color?: 'blue' | 'green' | 'yellow' | 'red' | 'slate'
   loading?: boolean
+  subtitle?: string
+  subtitleColor?: string
 }
 
 export default function StatsCard({
@@ -20,6 +22,8 @@ export default function StatsCard({
   trendValue,
   color = 'blue',
   loading = false,
+  subtitle,
+  subtitleColor = 'text-orange-500',
 }: StatsCardProps) {
   const colorStyles = {
     blue: {
@@ -80,6 +84,11 @@ export default function StatsCard({
               </span>
             </div>
           )}
+          {subtitle && (
+            <p className={`mt-1 text-xs font-medium ${subtitleColor}`}>
+              {subtitle}
+            </p>
+          )}
           {trend && trendValue && TrendIcon && (
             <div className={`mt-2 flex items-center gap-1 text-sm ${trendStyles[trend].color}`}>
               <TrendIcon className="h-4 w-4" />
@@ -94,3 +103,4 @@ export default function StatsCard({
     </Card>
   )
 }
+