feat: Add admin settings for dealer comment & domestic cost, enhance visitor country stats

- Add show_dealer_comment toggle to admin settings
- Add domestic_export_customs_krw setting for cost page
- Cost page now uses dynamic settings instead of hardcoded values
- Enhance Visitor Stats with dedicated Country Stats card with flags
- Fix hero_banners API route ordering (422 error fix)
- Fix banner toggle logic to check HeroBanner table instead of car.is_banner
- Add country flag emojis for 23+ countries

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/app/admin/settings/page.tsx

@@ -14,6 +14,8 @@ interface SystemSettings {
   cache_ttl_hours: number;
   container_logistics_usd: number;
   shoring_cost_usd: number;
+  domestic_export_customs_krw: number;
+  show_dealer_comment: boolean;
   referral_reward_enabled: boolean;
   referral_reward_percent: number;
   referral_reward_type: string;
@@ -57,6 +59,8 @@ export default function SettingsPage() {
     cache_ttl_hours: 2,
     container_logistics_usd: 3600,
     shoring_cost_usd: 300,
+    domestic_export_customs_krw: 1150000,
+    show_dealer_comment: true,
     referral_reward_enabled: true,
     referral_reward_percent: 10.0,
     referral_reward_type: 'one_time',
@@ -84,6 +88,8 @@ export default function SettingsPage() {
           cache_ttl_hours: data.cache_ttl_hours,
           container_logistics_usd: data.container_logistics_usd || 3600,
           shoring_cost_usd: data.shoring_cost_usd || 300,
+          domestic_export_customs_krw: data.domestic_export_customs_krw || 1150000,
+          show_dealer_comment: data.show_dealer_comment ?? true,
           referral_reward_enabled: data.referral_reward_enabled ?? true,
           referral_reward_percent: data.referral_reward_percent ?? 10.0,
           referral_reward_type: data.referral_reward_type || 'one_time',
@@ -234,6 +240,31 @@ export default function SettingsPage() {
           </div>
         </div>
 
+        {/* Display Settings */}
+        <div className="bg-white rounded-xl shadow-sm p-6">
+          <h2 className="text-lg font-semibold text-gray-800 mb-4 flex items-center gap-2">
+            <span>Display Settings</span>
+          </h2>
+
+          <div className="space-y-4">
+            <div className="flex items-center gap-3">
+              <label className="relative inline-flex items-center cursor-pointer">
+                <input
+                  type="checkbox"
+                  checked={formData.show_dealer_comment}
+                  onChange={(e) => setFormData(prev => ({ ...prev, show_dealer_comment: e.target.checked }))}
+                  className="sr-only peer"
+                />
+                <div className="w-11 h-6 bg-gray-200 peer-focus:outline-none peer-focus:ring-4 peer-focus:ring-primary-300 rounded-full peer peer-checked:after:translate-x-full rtl:peer-checked:after:-translate-x-full peer-checked:after:border-white after:content-[''] after:absolute after:top-[2px] after:start-[2px] after:bg-white after:border-gray-300 after:border after:rounded-full after:h-5 after:w-5 after:transition-all peer-checked:bg-primary-600"></div>
+              </label>
+              <div>
+                <span className="text-sm font-medium text-gray-700">Show Dealer Comment</span>
+                <p className="text-sm text-gray-500">차량 상세 페이지에서 딜러 코멘트 표시 여부</p>
+              </div>
+            </div>
+          </div>
+        </div>
+
         {/* Margin Settings */}
         <div className="bg-white rounded-xl shadow-sm p-6">
           <h2 className="text-lg font-semibold text-gray-800 mb-4 flex items-center gap-2">
@@ -388,6 +419,22 @@ export default function SettingsPage() {
               />
               <p className="mt-1 text-sm text-gray-500">쇼링비 - 컨테이너 고정 비용 (기본값: $300)</p>
             </div>
+
+            <div>
+              <label className="block text-sm font-medium text-gray-700 mb-1">
+                Korean Domestic + Export Customs (KRW)
+              </label>
+              <input
+                type="number"
+                min="0"
+                max="10000000"
+                step="10000"
+                value={formData.domestic_export_customs_krw}
+                onChange={(e) => handleChange('domestic_export_customs_krw', parseInt(e.target.value) || 1150000)}
+                className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500"
+              />
+              <p className="mt-1 text-sm text-gray-500">국내비용 + 수출통관비용 (기본값: ₩1,150,000)</p>
+            </div>
           </div>
 
           <div className="mt-4 p-4 bg-blue-50 rounded-lg">
@@ -396,6 +443,7 @@ export default function SettingsPage() {
               <p>Total Container Cost: ${formData.container_logistics_usd + formData.shoring_cost_usd}</p>
               <p>Small Car (5.5/10): ${((formData.container_logistics_usd + formData.shoring_cost_usd) * 0.275).toFixed(0)} per car</p>
               <p>Compact Car (4.5/10): ${((formData.container_logistics_usd + formData.shoring_cost_usd) * 0.225).toFixed(0)} per car</p>
+              <p className="mt-2 pt-2 border-t border-blue-200">Korean Domestic + Export Customs: ₩{formData.domestic_export_customs_krw.toLocaleString()}</p>
             </div>
           </div>
         </div>

frontend/src/app/admin/visitor-stats/page.tsx

@@ -3,22 +3,39 @@
 import { useState, useEffect } from 'react';
 import { visitorApi, VisitorStatsOverview, TopPage, TopReferrer, ChartData, RealtimeStats } from '@/lib/api';
 
-// Country code to name mapping
-const countryNames: Record<string, string> = {
-  MN: 'Mongolia',
-  RU: 'Russia',
-  KR: 'Korea',
-  US: 'United States',
-  CN: 'China',
-  JP: 'Japan',
-  DE: 'Germany',
-  FR: 'France',
-  GB: 'United Kingdom',
-  AU: 'Australia',
-  unknown: 'Unknown',
-  LO: 'Local',
+// Country code to name and flag mapping
+const countryInfo: Record<string, { name: string; flag: string }> = {
+  MN: { name: 'Mongolia', flag: '🇲🇳' },
+  RU: { name: 'Russia', flag: '🇷🇺' },
+  KR: { name: 'Korea', flag: '🇰🇷' },
+  US: { name: 'United States', flag: '🇺🇸' },
+  CN: { name: 'China', flag: '🇨🇳' },
+  JP: { name: 'Japan', flag: '🇯🇵' },
+  DE: { name: 'Germany', flag: '🇩🇪' },
+  FR: { name: 'France', flag: '🇫🇷' },
+  GB: { name: 'United Kingdom', flag: '🇬🇧' },
+  AU: { name: 'Australia', flag: '🇦🇺' },
+  CA: { name: 'Canada', flag: '🇨🇦' },
+  IN: { name: 'India', flag: '🇮🇳' },
+  SG: { name: 'Singapore', flag: '🇸🇬' },
+  HK: { name: 'Hong Kong', flag: '🇭🇰' },
+  TW: { name: 'Taiwan', flag: '🇹🇼' },
+  VN: { name: 'Vietnam', flag: '🇻🇳' },
+  TH: { name: 'Thailand', flag: '🇹🇭' },
+  MY: { name: 'Malaysia', flag: '🇲🇾' },
+  ID: { name: 'Indonesia', flag: '🇮🇩' },
+  PH: { name: 'Philippines', flag: '🇵🇭' },
+  KZ: { name: 'Kazakhstan', flag: '🇰🇿' },
+  UZ: { name: 'Uzbekistan', flag: '🇺🇿' },
+  UA: { name: 'Ukraine', flag: '🇺🇦' },
+  unknown: { name: 'Unknown', flag: '🌐' },
+  LO: { name: 'Local', flag: '🏠' },
 };
 
+const countryNames: Record<string, string> = Object.fromEntries(
+  Object.entries(countryInfo).map(([code, info]) => [code, info.name])
+);
+
 // Simple bar chart component
 const SimpleBarChart = ({ data, color = 'bg-primary-500', height = 120 }: {
   data: ChartData | null;
@@ -104,6 +121,61 @@ const BreakdownCard = ({ title, data, icon, nameMap }: {
   );
 };
 
+// Country Stats Card with flags
+const CountryStatsCard = ({ data }: { data: Record<string, number> }) => {
+  const total = Object.values(data).reduce((a, b) => a + b, 0);
+  const sortedEntries = Object.entries(data).sort((a, b) => b[1] - a[1]).slice(0, 10);
+
+  if (total === 0) {
+    return (
+      <div className="bg-white rounded-xl shadow-sm p-6">
+        <div className="flex items-center gap-2 mb-4">
+          <span className="text-2xl">🌍</span>
+          <h3 className="text-lg font-semibold text-gray-800">Visitors by Country</h3>
+        </div>
+        <div className="text-gray-400 text-center py-8">No country data available</div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="bg-white rounded-xl shadow-sm p-6">
+      <div className="flex items-center justify-between mb-6">
+        <div className="flex items-center gap-2">
+          <span className="text-2xl">🌍</span>
+          <h3 className="text-lg font-semibold text-gray-800">Visitors by Country</h3>
+        </div>
+        <span className="text-sm text-gray-500">Total: {total.toLocaleString()}</span>
+      </div>
+      <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
+        {sortedEntries.map(([code, value], index) => {
+          const info = countryInfo[code] || { name: code, flag: '🌐' };
+          const percentage = ((value / total) * 100).toFixed(1);
+
+          return (
+            <div key={code} className="flex items-center gap-3 p-3 bg-gray-50 rounded-lg hover:bg-gray-100 transition-colors">
+              <span className="text-2xl">{info.flag}</span>
+              <div className="flex-1 min-w-0">
+                <div className="flex justify-between items-center">
+                  <span className="font-medium text-gray-800 truncate">{info.name}</span>
+                  <span className="text-sm font-semibold text-primary-600">{value.toLocaleString()}</span>
+                </div>
+                <div className="w-full bg-gray-200 rounded-full h-2 mt-1">
+                  <div
+                    className="h-2 rounded-full bg-gradient-to-r from-primary-400 to-primary-600"
+                    style={{ width: `${(value / sortedEntries[0][1]) * 100}%` }}
+                  />
+                </div>
+                <span className="text-xs text-gray-500">{percentage}% of total</span>
+              </div>
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+};
+
 export default function VisitorStatsPage() {
   const [overview, setOverview] = useState<VisitorStatsOverview | null>(null);
   const [visitsChart, setVisitsChart] = useState<ChartData | null>(null);
@@ -315,8 +387,11 @@ export default function VisitorStatsPage() {
         </div>
       </div>
 
-      {/* Breakdowns */}
-      <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
+      {/* Country Stats - Full Width */}
+      <CountryStatsCard data={overview?.country_breakdown || {}} />
+
+      {/* Device & Browser Breakdowns */}
+      <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
         <BreakdownCard
           title="By Device"
           data={overview?.device_breakdown || {}}
@@ -327,12 +402,6 @@ export default function VisitorStatsPage() {
           data={overview?.browser_breakdown || {}}
           icon="&#127760;"
         />
-        <BreakdownCard
-          title="By Country"
-          data={overview?.country_breakdown || {}}
-          icon="&#127757;"
-          nameMap={countryNames}
-        />
       </div>
 
       {/* Tables */}