fix: add missing i18n files to public folder for GitHub Pages

- Copy translation files to public/i18n/app directory
- Add missing i18n dependencies to package.json
- Fixes translation keys showing instead of text on GitHub Pages

packages/fossflow-app/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "@isoflow/isopacks": "^0.0.10",
     "fossflow": "*",
-    "i18next": "^25.4.2",
+    "i18next": "^25.5.2",
     "i18next-browser-languagedetector": "^8.2.0",
     "i18next-http-backend": "^3.0.2",
     "react": "^18.2.0",

packages/fossflow-app/public/i18n/app/en-US.json

@@ -0,0 +1,11 @@
+{
+  "nav": {
+    "newDiagram": "New Diagram",
+    "saveSessionOnly": "Save (Session Only)",
+    "loadSessionOnly": "Load (Session Only)",
+    "importFile": "Import File",
+    "exportFile": "Export File",
+    "quickSaveSession": "Quick Save(Session)",
+    "serverStorage": "Server Storage"
+  }
+}

packages/fossflow-app/public/i18n/app/zh-CN.json

@@ -0,0 +1,11 @@
+{
+  "nav": {
+    "newDiagram": "新建图表",
+    "saveSessionOnly": "保存（仅会话）",
+    "loadSessionOnly": "加载（仅会话）",
+    "importFile": "导入文件",
+    "exportFile": "导出文件",
+    "quickSaveSession": "快速保存（会话）",
+    "serverStorage": "服务端存储"
+  }
+}