fix(backend): resolve federation forward traffic stats and listener disappearance (#208)

* fix(backend): add repository methods for federation forward runtime management

- GetActiveForwardPeerShareRuntimeByServiceName: lookup runtime by share_id and service_name
- MarkForwardPeerShareRuntimeReleasedByServiceName: release runtime by service_name
- ListActiveForwardPeerShareRuntimesByNodeAndServiceName: node-scoped query for flow processing

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* fix(backend): bind and release federation forward runtimes on service commands

- bindPeerShareForwardRuntimeServices: create runtime if missing, update ServiceName/Port/Applied/Status
- releasePeerShareForwardRuntimeServices: handle deleteservice command to mark runtime released
- parseFederationForwardServiceNamesForRelease: extract service names from delete payload
- Tests: bind creates runtime when missing, release marks runtime as released

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* fix(backend): scope federation flow lookup by node to avoid cross-share collisions

- flowUpload: use GetNodeBySecret to extract nodeID for flow processing
- processFlowItem: accept nodeID parameter and pass to flow handlers
- processPeerShareFlowByServiceName: try node-scoped query first, fallback to global
- Add warning log when multiple runtimes match (ambiguous)
- Tests: update all processFlowItem calls with nodeID parameter

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

* test(contract): adjust federation dual panel contract expectations

Update assertion for entry share runtime binding behavior after fix

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

---------

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

go-backend/internal/http/handler/handler.go

@@ -704,7 +704,8 @@ func (h *Handler) flowConfig(w http.ResponseWriter, r *http.Request) {
 
 func (h *Handler) flowUpload(w http.ResponseWriter, r *http.Request) {
 	secret := r.URL.Query().Get("secret")
-	if ok, _ := h.repo.NodeExistsBySecret(secret); !ok {
+	node, _ := h.repo.GetNodeBySecret(secret)
+	if node == nil {
 		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		_, _ = w.Write([]byte("ok"))
 		return
@@ -715,7 +716,7 @@ func (h *Handler) flowUpload(w http.ResponseWriter, r *http.Request) {
 		var items []flowItem
 		if json.Unmarshal([]byte(raw), &items) == nil {
 			for _, item := range items {
-				h.processFlowItem(item)
+				h.processFlowItem(node.ID, item)
 			}
 		}
 	}