Added unit and api tests

frontend/vitest.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from 'vitest/config';
+import vue from '@vitejs/plugin-vue';
+
+export default defineConfig({
+  plugins: [vue()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    include: ['src/**/*.test.ts', 'src/**/*.test.tsx'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'html'],
+      include: ['src/**/*.{ts,vue}', '!src/**/*.d.ts'],
+    },
+  },
+});