feat(i18n): 공통/주요 화면 문자열 치환, 포맷 정책 적용, 언어 전환 UX 및 스캔 스크립트 추가

src/i18n/index.js

@@ -31,6 +31,69 @@ const i18n = new VueI18n({
   locale: detectLocale(),
   fallbackLocale: 'en',
   messages: { ko, en, ja },
+  // 숫자/통화 포맷 정책
+  numberFormats: {
+    en: {
+      decimal: {
+        style: 'decimal',
+        minimumFractionDigits: 0,
+        maximumFractionDigits: 2
+      },
+      currency: {
+        style: 'currency',
+        currency: 'USD',
+        currencyDisplay: 'symbol',
+        minimumFractionDigits: 2,
+        maximumFractionDigits: 2
+      }
+    },
+    ko: {
+      decimal: {
+        style: 'decimal',
+        minimumFractionDigits: 0,
+        maximumFractionDigits: 2
+      },
+      currency: {
+        style: 'currency',
+        currency: 'KRW',
+        currencyDisplay: 'symbol',
+        minimumFractionDigits: 0,
+        maximumFractionDigits: 0
+      }
+    },
+    ja: {
+      decimal: {
+        style: 'decimal',
+        minimumFractionDigits: 0,
+        maximumFractionDigits: 2
+      },
+      currency: {
+        style: 'currency',
+        currency: 'JPY',
+        currencyDisplay: 'symbol',
+        minimumFractionDigits: 0,
+        maximumFractionDigits: 0
+      }
+    }
+  },
+  // 날짜/시간 포맷(예시)
+  dateTimeFormats: {
+    en: {
+      short: {
+        year: 'numeric', month: '2-digit', day: '2-digit'
+      }
+    },
+    ko: {
+      short: {
+        year: 'numeric', month: '2-digit', day: '2-digit'
+      }
+    },
+    ja: {
+      short: {
+        year: 'numeric', month: '2-digit', day: '2-digit'
+      }
+    }
+  },
   silentTranslationWarn: process.env.NODE_ENV === 'production',
   missing(locale, key) {
     if (process.env.NODE_ENV !== 'production') {