Feat v0.6.0 cluster registry (#36)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

server/handlers/cluster.go

@@ -0,0 +1,32 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"switchboard-core/store"
+)
+
+// ClusterHandler serves the admin cluster API.
+type ClusterHandler struct {
+	stores store.Stores
+}
+
+func NewClusterHandler(stores store.Stores) *ClusterHandler {
+	return &ClusterHandler{stores: stores}
+}
+
+// ListNodes returns all registered cluster nodes.
+// GET /api/v1/admin/cluster
+func (h *ClusterHandler) ListNodes(c *gin.Context) {
+	nodes, err := h.stores.Cluster.ListNodes(c.Request.Context())
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to list cluster nodes"})
+		return
+	}
+	if nodes == nil {
+		nodes = []store.ClusterNode{}
+	}
+	c.JSON(http.StatusOK, gin.H{"data": nodes})
+}