feat: update AIConfig route handler and add validation utility function with tests

internal/pkg/httpx/params/params_test.go

@@ -0,0 +1,31 @@
+package params
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+)
+
+func newJSONContext(body string) *gin.Context {
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	ctx, _ := gin.CreateTestContext(w)
+	ctx.Request = httptest.NewRequest(http.MethodPost, "/", strings.NewReader(body))
+	ctx.Request.Header.Set("Content-Type", "application/json")
+	return ctx
+}
+
+func TestReadJSONAcceptsRootArray(t *testing.T) {
+	var ids []int64
+
+	if err := ReadJSON(newJSONContext(`[3,4]`), &ids); err != nil {
+		t.Fatalf("ReadJSON returned error: %v", err)
+	}
+
+	if len(ids) != 2 || ids[0] != 3 || ids[1] != 4 {
+		t.Fatalf("expected ids [3 4], got %#v", ids)
+	}
+}