feat(galleryop): add NodeProgress + OpStatus.Nodes for per-node breakdown

Adds the data model the UI needs to render an expandable per-node
breakdown of a fanned-out backend install. NodeProgress carries node
identity (ID + name), per-node status (queued / running_on_worker /
success / error / downloading), the current file + bytes + percentage
from the Phase 2 progress stream, and any per-node error.

OpStatus.Nodes is the slice the /api/operations handler will surface
in a follow-up.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

core/services/galleryop/node_progress_test.go

@@ -0,0 +1,42 @@
+package galleryop_test
+
+import (
+	"encoding/json"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
+	"github.com/mudler/LocalAI/core/services/galleryop"
+)
+
+var _ = Describe("OpStatus.Nodes", func() {
+	It("defaults to empty on a fresh OpStatus", func() {
+		os := &galleryop.OpStatus{}
+		Expect(os.Nodes).To(BeEmpty())
+	})
+
+	It("JSON round-trips with all NodeProgress fields", func() {
+		os := &galleryop.OpStatus{
+			Nodes: []galleryop.NodeProgress{
+				{
+					NodeID:     "node-1",
+					NodeName:   "worker-a",
+					Status:     "running_on_worker",
+					FileName:   "vllm.tar.zst",
+					Current:    "412 MB",
+					Total:      "2.1 GB",
+					Percentage: 19.6,
+					Phase:      "downloading",
+					Error:      "",
+				},
+			},
+		}
+		raw, err := json.Marshal(os)
+		Expect(err).ToNot(HaveOccurred())
+
+		got := &galleryop.OpStatus{}
+		Expect(json.Unmarshal(raw, got)).To(Succeed())
+		Expect(got.Nodes).To(HaveLen(1))
+		Expect(got.Nodes[0]).To(Equal(os.Nodes[0]))
+	})
+})

core/services/galleryop/operation.go

@@ -53,6 +53,30 @@ type OpStatus struct {
 	GalleryElementName string  `json:"gallery_element_name"`
 	Cancelled          bool    `json:"cancelled"`   // Cancelled is true if the operation was cancelled
 	Cancellable        bool    `json:"cancellable"` // Cancellable is true if the operation can be cancelled
+
+	// Nodes is the per-node breakdown for a fanned-out backend install.
+	// Populated by DistributedBackendManager (per-node terminal status)
+	// and by the Phase 2 progress bridge (per-byte ticks). The
+	// /api/operations handler surfaces this so the UI can render an
+	// expandable per-node view of an in-flight install.
+	Nodes []NodeProgress `json:"nodes,omitempty"`
+}
+
+// NodeProgress is a single node's contribution to a backend install
+// operation. Populated by DistributedBackendManager (per-node terminal
+// status) and by the Phase 2 progress bridge (per-byte ticks). Read by
+// the /api/operations handler so the UI can render an expandable
+// per-node breakdown.
+type NodeProgress struct {
+	NodeID     string  `json:"node_id"`
+	NodeName   string  `json:"node_name"`
+	Status     string  `json:"status"` // "queued" | "running_on_worker" | "success" | "error" | "downloading"
+	FileName   string  `json:"file_name,omitempty"`
+	Current    string  `json:"current,omitempty"`
+	Total      string  `json:"total,omitempty"`
+	Percentage float64 `json:"percentage"`
+	Phase      string  `json:"phase,omitempty"`
+	Error      string  `json:"error,omitempty"`
 }
 
 type OpCache struct {