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

selective-vpn-api/app/transport_client_runtime_alloc.go

@@ -0,0 +1,17 @@
+package app
+
+func allocateTransportSlots(items []TransportClient) (string, int) {
+	usedMarks := map[uint64]struct{}{}
+	usedPrefs := map[int]struct{}{}
+	for _, it := range items {
+		if n, ok := parseTransportMarkHex(it.MarkHex); ok {
+			usedMarks[n] = struct{}{}
+		}
+		if p, ok := parseTransportPref(it.PriorityBase); ok {
+			usedPrefs[p] = struct{}{}
+		}
+	}
+	mark := nextTransportMark(usedMarks)
+	pref := nextTransportPref(usedPrefs)
+	return formatTransportMarkHex(mark), pref
+}