Refactor code structure for improved readability and maintainability; remove redundant code blocks and optimize function calls.

apps/api/tsconfig.build.json

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "./src"
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
+}