Add configurable CC cost for banner vehicle PDF/description view

- Add cc_per_banner_view setting to system_settings (default 0.1 CC)
- Update car detail page to use dynamic CC value from settings
- Add CC per Banner View field in admin settings page
- Replace hardcoded 0.1 CC with configurable value

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -11,6 +11,7 @@ interface SystemSettings {
   cc_per_view: number;
   cc_signup_bonus: number;
   cars_per_cc: number;
+  cc_per_banner_view: number;
   cache_ttl_hours: number;
   container_logistics_usd: number;
   shoring_cost_usd: number;
@@ -56,6 +57,7 @@ export default function SettingsPage() {
     cc_per_view: 1,
     cc_signup_bonus: 3,
     cars_per_cc: 3,
+    cc_per_banner_view: 0.1,
     cache_ttl_hours: 2,
     container_logistics_usd: 3600,
     shoring_cost_usd: 300,
@@ -85,6 +87,7 @@ export default function SettingsPage() {
           cc_per_view: data.cc_per_view,
           cc_signup_bonus: data.cc_signup_bonus,
           cars_per_cc: data.cars_per_cc || 3,
+          cc_per_banner_view: data.cc_per_banner_view ?? 0.1,
           cache_ttl_hours: data.cache_ttl_hours,
           container_logistics_usd: data.container_logistics_usd || 3600,
           shoring_cost_usd: data.shoring_cost_usd || 300,
@@ -372,6 +375,22 @@ export default function SettingsPage() {
               />
               <p className="mt-1 text-sm text-gray-500">Free CC for new users</p>
             </div>
+
+            <div>
+              <label className="block text-sm font-medium text-gray-700 mb-1">
+                CC per Banner View (PDF/Description)
+              </label>
+              <input
+                type="number"
+                min="0"
+                max="10"
+                step="0.1"
+                value={formData.cc_per_banner_view}
+                onChange={(e) => setFormData(prev => ({ ...prev, cc_per_banner_view: parseFloat(e.target.value) || 0.1 }))}
+                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">배너 차량 PDF/상세 정보 열람 비용 (기본값: 0.1 CC)</p>
+            </div>
           </div>
 
           <div className="mt-4 p-4 bg-blue-50 rounded-lg">