Menyelesaikan object user dan init base

src/core/exceptions/README.md

@@ -0,0 +1,12 @@
+core/exceptions/
+
+Penjelasan:
+Berisi global exception filters dan custom exception classes.
+
+Isi yang direkomendasikan:
+- http-exception.filter.ts
+- domain-exception.ts (custom domain exception base)
+
+Aturan:
+- Exception filter mengubah exception menjadi response standar API.
+- Gunakan kode error konsisten (error code constant) agar client dapat menangani error.

src/core/exceptions/http-exception.filter.ts

@@ -0,0 +1,18 @@
+import { ExceptionFilter, Catch, ArgumentsHost } from '@nestjs/common';
+
+@Catch()
+export class HttpExceptionFilter implements ExceptionFilter {
+  catch(exception: any, host: ArgumentsHost) {
+    const ctx = host.switchToHttp();
+    const response = ctx.getResponse();
+    const status = exception.getStatus ? exception.getStatus() : 500;
+
+    response.status(status).json({
+      success: false,
+      error: {
+        code: exception.code || 'INTERNAL_ERROR',
+        message: exception.message || 'Internal server error',
+      },
+    });
+  }
+}