feat(domain): complete phase 2 backend core

server/api/responses.ts

@@ -0,0 +1,30 @@
+import "server-only";
+
+import { NextResponse } from "next/server";
+import { DomainError } from "../domain/errors";
+
+export function apiSuccess<T>(data: T, init?: ResponseInit): NextResponse {
+  return NextResponse.json({ ok: true, data }, init);
+}
+
+export function apiError(error: unknown): NextResponse {
+  if (error instanceof DomainError) {
+    return NextResponse.json(
+      {
+        ok: false,
+        error: {
+          code: error.code,
+          message: error.message,
+          ...(error.details ? { details: error.details } : {}),
+        },
+      },
+      { status: error.status },
+    );
+  }
+
+  console.error("Unhandled API error", error);
+  return NextResponse.json(
+    { ok: false, error: { code: "INTERNAL_ERROR", message: "Beklenmeyen bir sunucu hatası oluştu." } },
+    { status: 500 },
+  );
+}