feat: add new interfaces, services, and utilities for API integration

refactor: reorganize type definitions and improve type safety

build: add lodash and @types/lodash as dependencies

chore: update tsconfig and vite config for path aliases

style: improve code organization and add documentation comments

fix: correct type usage in LanguageSwitcher component

perf: implement snackbar provider for global notifications

test: add new test interfaces and utility functions

ci: update pnpm-lock.yaml with new dependencies

package.json

@@ -19,6 +19,7 @@
     "dayjs": "^1.11.18",
     "i18next": "^25.5.3",
     "i18next-browser-languagedetector": "^8.2.0",
+    "lodash": "^4.17.21",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-hook-form": "^7.64.0",
@@ -30,6 +31,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.36.0",
+    "@types/lodash": "^4.17.20",
     "@types/node": "^24.6.0",
     "@types/react": "^19.1.16",
     "@types/react-dom": "^19.1.9",