platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/transport_handlers_interfaces.go

@@ -0,0 +1,40 @@
+package app
+
+import "net/http"
+
+func handleTransportInterfaces(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	transportMu.Lock()
+	clientsState := loadTransportClientsState()
+	ifacesState := loadTransportInterfacesState()
+	snapshot := captureTransportInterfacesStateSnapshot(clientsState, ifacesState)
+	transportMu.Unlock()
+
+	normIfaces, changed := normalizeTransportInterfacesState(ifacesState, clientsState.Items)
+	if changed {
+		if err := saveTransportInterfacesIfSnapshotCurrent(snapshot, normIfaces); err != nil {
+			writeJSON(w, http.StatusOK, TransportInterfacesResponse{
+				OK:      false,
+				Code:    "TRANSPORT_INTERFACES_SAVE_FAILED",
+				Message: "interfaces state save failed: " + err.Error(),
+			})
+			return
+		}
+	}
+
+	items := buildTransportInterfaceItems(normIfaces.Items, clientsState.Items)
+	if adguardTarget, ok := buildTransportPolicyAdGuardTarget(); ok {
+		items = appendTransportVirtualInterfaceItems(items, []TransportClient{adguardTarget})
+	}
+
+	writeJSON(w, http.StatusOK, TransportInterfacesResponse{
+		OK:      true,
+		Message: "ok",
+		Count:   len(items),
+		Items:   items,
+	})
+}