refactor: simplify config and remove unused database tables

- Remove system_config, beta_codes, signal_source tables and related code
- Simplify config.go to only read from .env (APIServerPort, JWTSecret, RegistrationEnabled)
- Remove GetCustomCoins, use all USDT perpetual contracts for WSMonitor
- Add trader_equity_snapshots table for equity tracking
- Remove signal source modal from frontend AITradersPage
- Fix WSMonitor nil panic by restoring initialization in main.go

web/src/components/AITradersPage.tsx

@@ -30,10 +30,8 @@ import {
   Trash2,
   Plus,
   Users,
-  AlertTriangle,
   BookOpen,
   HelpCircle,
-  Radio,
   Pencil,
 } from 'lucide-react'
 import { confirmToast } from '../lib/notify'
@@ -71,7 +69,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
   const [showEditModal, setShowEditModal] = useState(false)
   const [showModelModal, setShowModelModal] = useState(false)
   const [showExchangeModal, setShowExchangeModal] = useState(false)
-  const [showSignalSourceModal, setShowSignalSourceModal] = useState(false)
   const [editingModel, setEditingModel] = useState<string | null>(null)
   const [editingExchange, setEditingExchange] = useState<string | null>(null)
   const [editingTrader, setEditingTrader] = useState<any>(null)
@@ -79,13 +76,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
   const [allExchanges, setAllExchanges] = useState<Exchange[]>([])
   const [supportedModels, setSupportedModels] = useState<AIModel[]>([])
   const [supportedExchanges, setSupportedExchanges] = useState<Exchange[]>([])
-  const [userSignalSource, setUserSignalSource] = useState<{
-    coinPoolUrl: string
-    oiTopUrl: string
-  }>({
-    coinPoolUrl: '',
-    oiTopUrl: '',
-  })
 
   const { data: traders, mutate: mutateTraders, isLoading: isTradersLoading } = useSWR<TraderInfo[]>(
     user && token ? 'traders' : null,
@@ -127,17 +117,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
         setAllExchanges(exchangeConfigs)
         setSupportedModels(supportedModels)
         setSupportedExchanges(supportedExchanges)
-
-        // 加载用户信号源配置
-        try {
-          const signalSource = await api.getUserSignalSource()
-          setUserSignalSource({
-            coinPoolUrl: signalSource.coin_pool_url || '',
-            oiTopUrl: signalSource.oi_top_url || '',
-          })
-        } catch (error) {
-          console.log('📡 用户信号源配置暂未设置')
-        }
       } catch (error) {
         console.error('Failed to load configs:', error)
       }
@@ -717,24 +696,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
     setShowExchangeModal(true)
   }
 
-  const handleSaveSignalSource = async (
-    coinPoolUrl: string,
-    oiTopUrl: string
-  ) => {
-    try {
-      await toast.promise(api.saveUserSignalSource(coinPoolUrl, oiTopUrl), {
-        loading: '正在保存…',
-        success: '保存成功',
-        error: '保存失败',
-      })
-      setUserSignalSource({ coinPoolUrl, oiTopUrl })
-      setShowSignalSourceModal(false)
-    } catch (error) {
-      console.error('Failed to save signal source:', error)
-      toast.error(t('saveSignalSourceFailed', language))
-    }
-  }
-
   return (
     <div className="space-y-4 md:space-y-6 animate-fade-in">
       {/* Header */}
@@ -798,19 +759,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
             {t('exchanges', language)}
           </button>
 
-          <button
-            onClick={() => setShowSignalSourceModal(true)}
-            className="px-3 md:px-4 py-2 rounded text-xs md:text-sm font-semibold transition-all hover:scale-105 flex items-center gap-1 md:gap-2 whitespace-nowrap"
-            style={{
-              background: '#2B3139',
-              color: '#EAECEF',
-              border: '1px solid #474D57',
-            }}
-          >
-            <Radio className="w-3 h-3 md:w-4 md:h-4" />
-            {t('signalSource', language)}
-          </button>
-
           <button
             onClick={() => setShowCreateModal(true)}
             disabled={
@@ -834,54 +782,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
         </div>
       </div>
 
-      {/* 信号源配置警告 */}
-      {traders &&
-        traders.some((t) => t.use_coin_pool || t.use_oi_top) &&
-        !userSignalSource.coinPoolUrl &&
-        !userSignalSource.oiTopUrl && (
-          <div
-            className="rounded-lg px-4 py-3 flex items-start gap-3 animate-slide-in"
-            style={{
-              background: 'rgba(246, 70, 93, 0.1)',
-              border: '1px solid rgba(246, 70, 93, 0.3)',
-            }}
-          >
-            <AlertTriangle
-              size={20}
-              className="flex-shrink-0 mt-0.5"
-              style={{ color: '#F6465D' }}
-            />
-            <div className="flex-1">
-              <div className="font-semibold mb-1" style={{ color: '#F6465D' }}>
-                ⚠️ {t('signalSourceNotConfigured', language)}
-              </div>
-              <div className="text-sm" style={{ color: '#848E9C' }}>
-                <p className="mb-2">
-                  {t('signalSourceWarningMessage', language)}
-                </p>
-                <p>
-                  <strong>{t('solutions', language)}</strong>
-                </p>
-                <ul className="list-disc list-inside space-y-1 ml-2 mt-1">
-                  <li>点击"{t('signalSource', language)}"按钮配置API地址</li>
-                  <li>或在交易员配置中禁用"使用币种池"和"使用OI Top"</li>
-                  <li>或在交易员配置中设置自定义币种列表</li>
-                </ul>
-              </div>
-              <button
-                onClick={() => setShowSignalSourceModal(true)}
-                className="mt-3 px-3 py-1.5 rounded text-sm font-semibold transition-all hover:scale-105"
-                style={{
-                  background: '#F0B90B',
-                  color: '#000',
-                }}
-              >
-                {t('configureSignalSourceNow', language)}
-              </button>
-            </div>
-          </div>
-        )}
-
       {/* Configuration Status */}
       <div className="grid grid-cols-1 lg:grid-cols-2 gap-4 md:gap-6">
         {/* AI Models */}
@@ -1304,17 +1204,6 @@ export function AITradersPage({ onTraderSelect }: AITradersPageProps) {
           language={language}
         />
       )}
-
-      {/* Signal Source Configuration Modal */}
-      {showSignalSourceModal && (
-        <SignalSourceModal
-          coinPoolUrl={userSignalSource.coinPoolUrl}
-          oiTopUrl={userSignalSource.oiTopUrl}
-          onSave={handleSaveSignalSource}
-          onClose={() => setShowSignalSourceModal(false)}
-          language={language}
-        />
-      )}
     </div>
   )
 }
@@ -1364,141 +1253,6 @@ function Tooltip({
   )
 }
 
-// Signal Source Configuration Modal Component
-function SignalSourceModal({
-  coinPoolUrl,
-  oiTopUrl,
-  onSave,
-  onClose,
-  language,
-}: {
-  coinPoolUrl: string
-  oiTopUrl: string
-  onSave: (coinPoolUrl: string, oiTopUrl: string) => void
-  onClose: () => void
-  language: Language
-}) {
-  const [coinPool, setCoinPool] = useState(coinPoolUrl || '')
-  const [oiTop, setOiTop] = useState(oiTopUrl || '')
-
-  const handleSubmit = (e: React.FormEvent) => {
-    e.preventDefault()
-    onSave(coinPool.trim(), oiTop.trim())
-  }
-
-  return (
-    <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4 overflow-y-auto">
-      <div
-        className="bg-gray-800 rounded-lg w-full max-w-lg relative my-8"
-        style={{
-          background: '#1E2329',
-          maxHeight: 'calc(100vh - 4rem)',
-        }}
-      >
-        <h3 className="text-xl font-bold mb-4" style={{ color: '#EAECEF' }}>
-          {t('signalSourceConfig', language)}
-        </h3>
-
-        <form onSubmit={handleSubmit} className="px-6 pb-6">
-          <div
-            className="space-y-4 overflow-y-auto"
-            style={{ maxHeight: 'calc(100vh - 16rem)' }}
-          >
-            <div>
-              <label
-                className="block text-sm font-semibold mb-2"
-                style={{ color: '#EAECEF' }}
-              >
-                COIN POOL URL
-              </label>
-              <input
-                type="url"
-                value={coinPool}
-                onChange={(e) => setCoinPool(e.target.value)}
-                placeholder="https://api.example.com/coinpool"
-                className="w-full px-3 py-2 rounded"
-                style={{
-                  background: '#0B0E11',
-                  border: '1px solid #2B3139',
-                  color: '#EAECEF',
-                }}
-              />
-              <div className="text-xs mt-1" style={{ color: '#848E9C' }}>
-                {t('coinPoolDescription', language)}
-              </div>
-            </div>
-
-            <div>
-              <label
-                className="block text-sm font-semibold mb-2"
-                style={{ color: '#EAECEF' }}
-              >
-                OI TOP URL
-              </label>
-              <input
-                type="url"
-                value={oiTop}
-                onChange={(e) => setOiTop(e.target.value)}
-                placeholder="https://api.example.com/oitop"
-                className="w-full px-3 py-2 rounded"
-                style={{
-                  background: '#0B0E11',
-                  border: '1px solid #2B3139',
-                  color: '#EAECEF',
-                }}
-              />
-              <div className="text-xs mt-1" style={{ color: '#848E9C' }}>
-                {t('oiTopDescription', language)}
-              </div>
-            </div>
-
-            <div
-              className="p-4 rounded"
-              style={{
-                background: 'rgba(240, 185, 11, 0.1)',
-                border: '1px solid rgba(240, 185, 11, 0.2)',
-              }}
-            >
-              <div
-                className="text-sm font-semibold mb-2"
-                style={{ color: '#F0B90B' }}
-              >
-                ℹ️ {t('information', language)}
-              </div>
-              <div className="text-xs space-y-1" style={{ color: '#848E9C' }}>
-                <div>{t('signalSourceInfo1', language)}</div>
-                <div>{t('signalSourceInfo2', language)}</div>
-                <div>{t('signalSourceInfo3', language)}</div>
-              </div>
-            </div>
-          </div>
-
-          <div
-            className="flex gap-3 mt-6 pt-4 sticky bottom-0"
-            style={{ background: '#1E2329' }}
-          >
-            <button
-              type="button"
-              onClick={onClose}
-              className="flex-1 px-4 py-2 rounded text-sm font-semibold"
-              style={{ background: '#2B3139', color: '#848E9C' }}
-            >
-              {t('cancel', language)}
-            </button>
-            <button
-              type="submit"
-              className="flex-1 px-4 py-2 rounded text-sm font-semibold"
-              style={{ background: '#F0B90B', color: '#000' }}
-            >
-              {t('save', language)}
-            </button>
-          </div>
-        </form>
-      </div>
-    </div>
-  )
-}
-
 // Model Configuration Modal Component
 function ModelConfigModal({
   allModels,