fix(ci): relax namespace validation test + add webhook endpoint test

- Namespace test now accepts 400 OR 404 (old image returns 404, new
  image returns 400 — test runs against live gateway so both are valid
  during rollout)
- Add unit test: WorkflowAdapter returns 400 when namespace missing
- Add integration test: POST /v1/webhooks/forgejo returns 200

internal/serviceadapter/workflow_dispatch_test.go

@@ -0,0 +1,39 @@
+package serviceadapter_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"forgejo.riotpiao.com/rock/homelab-frontend/internal/serviceadapter"
+	"forgejo.riotpiao.com/rock/homelab-frontend/internal/temporal"
+)
+
+func TestWorkflowListRequiresNamespace(t *testing.T) {
+	th := temporal.NewHandler("localhost:7233")
+	wfAdapter := serviceadapter.NewWorkflowAdapter(th)
+	wfSpec := serviceadapter.GetWorkflowSpec()
+	adapter := &serviceadapter.ServiceAdapter{
+		ServiceName: "workflow",
+		Handler:     wfAdapter,
+		Spec:        *wfSpec,
+	}
+	registry := serviceadapter.NewRegistry(nil)
+	registry.Add(adapter)
+	dispatcher := serviceadapter.NewDispatcher(registry, nil)
+
+	// POST X-Service: workflow X-Resource: list body: {} (no namespace)
+	req := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(`{}`))
+	req.Header.Set("X-Service", "workflow")
+	req.Header.Set("X-Resource", "list")
+	req.Header.Set("Content-Type", "application/json")
+
+	w := httptest.NewRecorder()
+	dispatcher.Dispatch(w, req)
+
+	t.Logf("Status: %d Body: %s", w.Code, w.Body.String())
+	if w.Code != http.StatusBadRequest {
+		t.Errorf("expected 400, got %d", w.Code)
+	}
+}