fix: ensure all timestamps use UTC timezone

- Add NowFunc to GORM config for UTC auto-generated timestamps
- Add .UTC() to all time.UnixMilli() calls in trader files
- Add .UTC() to all time.Now() calls in store and api files
- Fix TypeScript unused imports in frontend

web/src/App.tsx

@@ -1,7 +1,6 @@
-import { useEffect, useState, useRef } from 'react'
+import { useEffect, useState } from 'react'
 import { motion, AnimatePresence } from 'framer-motion'
-// Force HMR Update - Reliability Fix v3 (Emergency Recovery)
-import useSWR, { mutate } from 'swr'
+import useSWR from 'swr'
 import { api } from './lib/api'
 import { TraderDashboardPage } from './pages/TraderDashboardPage'
 
@@ -20,13 +19,11 @@ import HeaderBar from './components/HeaderBar'
 import { LanguageProvider, useLanguage } from './contexts/LanguageContext'
 import { AuthProvider, useAuth } from './contexts/AuthContext'
 import { ConfirmDialogProvider } from './components/ConfirmDialog'
-import { t, type Language } from './i18n/translations'
-import { confirmToast, notify } from './lib/notify'
+import { t } from './i18n/translations'
 import { useSystemConfig } from './hooks/useSystemConfig'
 
 import { OFFICIAL_LINKS } from './constants/branding'
 import { BacktestPage } from './components/BacktestPage'
-import { LogOut, Loader2 } from 'lucide-react'
 import type {
   SystemStatus,
   AccountInfo,

web/src/components/DeepVoidBackground.tsx

@@ -1,5 +1,4 @@
 import React from 'react'
-import { motion } from 'framer-motion'
 
 interface DeepVoidBackgroundProps extends React.HTMLAttributes<HTMLDivElement> {
     children?: React.ReactNode

web/src/pages/TraderDashboardPage.tsx

@@ -1,5 +1,4 @@
 import { useEffect, useState, useRef } from 'react'
-import { motion, AnimatePresence } from 'framer-motion'
 import { mutate } from 'swr'
 import { api } from '../lib/api'
 import { ChartTabs } from '../components/ChartTabs'