Feature: Russian language support & Vehicle Requests improvements

- Add Russian language support (title_ru, subtitle_ru) for hero banners
- Add fuel/transmission translations for Mongolian (경유→Дизель, 오토→Автомат)
- Improve Vehicle Requests admin page:
  - Display real request ID and user email
  - Show detailed request info (maker, grade, year, fuel, mileage)
  - Replace modal search with Cars page integration
- Add "Add to Request" flow in Cars page for vehicle recommendations
- Fix image URL handling in FilmStripSlider and car detail page

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

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

frontend/src/app/page.tsx

@@ -13,22 +13,21 @@ export default function Home() {
   const [bannerSettings, setBannerSettings] = useState<HeroBannerSettings | undefined>();
 
   useEffect(() => {
+    const loadBanners = async () => {
+      try {
+        const [bannersData, settingsData] = await Promise.all([
+          heroBannersApi.getList(language),
+          heroBannersApi.getSettings(),
+        ]);
+        setBanners(bannersData);
+        setBannerSettings(settingsData);
+      } catch (error) {
+        console.error('Failed to load banners:', error);
+        // 에러 시 샘플 배너 사용 (FilmStripSlider 내부에서 처리)
+      }
+    };
     loadBanners();
-  }, []);
-
-  const loadBanners = async () => {
-    try {
-      const [bannersData, settingsData] = await Promise.all([
-        heroBannersApi.getList(language),
-        heroBannersApi.getSettings(),
-      ]);
-      setBanners(bannersData);
-      setBannerSettings(settingsData);
-    } catch (error) {
-      console.error('Failed to load banners:', error);
-      // 에러 시 샘플 배너 사용 (FilmStripSlider 내부에서 처리)
-    }
-  };
+  }, [language]);
 
   return (
     <div>