refactor: restructure project directories for better modularity

- Delete llm/ dead code (3 files, zero references)
- Split mcp/ into sub-packages: mcp/provider/ (8 providers) and
  mcp/payment/ (4 payment clients) with registry pattern
- Export Client internal fields and ClientHooks interface for
  sub-package access
- Split api/server.go (3892 lines) into 8 domain-specific handler files
- Split trader/auto_trader.go (2296 lines) into 5 focused files
- Reorganize web/src/components/ flat files into auth/, charts/,
  trader/, common/, modals/, backtest/ subdirectories
- Update all consumer imports to use registry-based provider creation

web/src/pages/LandingPage.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react'
-import HeaderBar from '../components/HeaderBar'
+import HeaderBar from '../components/common/HeaderBar'
 import LoginModal from '../components/landing/LoginModal'
-import { LoginRequiredOverlay } from '../components/LoginRequiredOverlay'
+import { LoginRequiredOverlay } from '../components/auth/LoginRequiredOverlay'
 import FooterSection from '../components/landing/FooterSection'
 import TerminalHero from '../components/landing/core/TerminalHero'
 import LiveFeed from '../components/landing/core/LiveFeed'

web/src/pages/PageNotFound.tsx

@@ -1,4 +1,4 @@
-import { DeepVoidBackground } from '../components/DeepVoidBackground'
+import { DeepVoidBackground } from '../components/common/DeepVoidBackground'
 import { AlertCircle, Home } from 'lucide-react'
 
 export function PageNotFound() {

web/src/pages/SettingsPage.tsx

@@ -4,9 +4,9 @@ import { User, Cpu, Building2, MessageCircle, Eye, EyeOff, ChevronRight, Plus, P
 import { useAuth } from '../contexts/AuthContext'
 import { useLanguage } from '../contexts/LanguageContext'
 import { api } from '../lib/api'
-import { ExchangeConfigModal } from '../components/traders/ExchangeConfigModal'
-import { TelegramConfigModal } from '../components/traders/TelegramConfigModal'
-import { ModelConfigModal } from '../components/AITradersPage'
+import { ExchangeConfigModal } from '../components/trader/ExchangeConfigModal'
+import { TelegramConfigModal } from '../components/trader/TelegramConfigModal'
+import { ModelConfigModal } from '../components/trader/AITradersPage'
 import type { Exchange, AIModel } from '../types'
 
 type Tab = 'account' | 'models' | 'exchanges' | 'telegram'

web/src/pages/StrategyMarketPage.tsx

@@ -20,7 +20,7 @@ import {
 import { useLanguage } from '../contexts/LanguageContext'
 import { useAuth } from '../contexts/AuthContext'
 import { toast } from 'sonner'
-import { DeepVoidBackground } from '../components/DeepVoidBackground'
+import { DeepVoidBackground } from '../components/common/DeepVoidBackground'
 
 interface PublicStrategy {
   id: string

web/src/pages/StrategyStudioPage.tsx

@@ -38,7 +38,7 @@ import { RiskControlEditor } from '../components/strategy/RiskControlEditor'
 import { PromptSectionsEditor } from '../components/strategy/PromptSectionsEditor'
 import { PublishSettingsEditor } from '../components/strategy/PublishSettingsEditor'
 import { GridConfigEditor, defaultGridConfig } from '../components/strategy/GridConfigEditor'
-import { DeepVoidBackground } from '../components/DeepVoidBackground'
+import { DeepVoidBackground } from '../components/common/DeepVoidBackground'
 
 const API_BASE = import.meta.env.VITE_API_BASE || ''
 

web/src/pages/TraderDashboardPage.tsx

@@ -1,15 +1,15 @@
 import { useEffect, useState, useRef } from 'react'
 import { mutate } from 'swr'
 import { api } from '../lib/api'
-import { ChartTabs } from '../components/ChartTabs'
-import { DecisionCard } from '../components/DecisionCard'
-import { PositionHistory } from '../components/PositionHistory'
-import { PunkAvatar, getTraderAvatar } from '../components/PunkAvatar'
+import { ChartTabs } from '../components/charts/ChartTabs'
+import { DecisionCard } from '../components/trader/DecisionCard'
+import { PositionHistory } from '../components/trader/PositionHistory'
+import { PunkAvatar, getTraderAvatar } from '../components/common/PunkAvatar'
 import { confirmToast, notify } from '../lib/notify'
 import { formatPrice, formatQuantity } from '../utils/format'
 import { t, type Language } from '../i18n/translations'
 import { LogOut, Loader2, Eye, EyeOff, Copy, Check } from 'lucide-react'
-import { DeepVoidBackground } from '../components/DeepVoidBackground'
+import { DeepVoidBackground } from '../components/common/DeepVoidBackground'
 import { GridRiskPanel } from '../components/strategy/GridRiskPanel'
 import type {
     SystemStatus,