fix architecture and write new tests

apps/api/vitest.api.config.ts

@@ -0,0 +1,16 @@
+import { loadEnv } from 'vite'
+import { defineConfig } from 'vitest/config'
+
+Object.assign(process.env, loadEnv('test', process.cwd(), ''))
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    include: ['src/tests/api/**/*.test.ts'],
+    testTimeout: 30000,
+    hookTimeout: 30000,
+    pool: 'forks',
+    poolOptions: { forks: { singleFork: true } },
+  },
+})