feat: add internationalization support and update layout

- Added i18n module to nuxt.config.ts with English and Traditional Chinese locales.
- Created locale files for English, Traditional Chinese, and German.
- Updated default layout to use script setup syntax.
- Modified index page structure for future content.
- Implemented API endpoint for object storage file redirection.
- Removed unused CORS middleware.
- Created a new feed route handler.

i18n/locales/de.json

@@ -0,0 +1,4 @@
+{
+    "dailybriefing": "",
+    "Welcome": ""
+}

i18n/locales/en.json

@@ -0,0 +1,7 @@
+{
+    "core": {
+        "sitename": "BlindSpec"
+    },
+    "dailybriefing": "Daily Briefing",
+    "Welcome": "Welcome"
+}

i18n/locales/zh-tw.json

@@ -0,0 +1,7 @@
+{
+    "core": {
+        "sitename": "新聞盲點平台"
+    },
+    "dailybriefing": "今日報導",
+    "Welcome": "歡迎"
+}