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

selective-vpn-api/app/domains_handlers_helpers.go

@@ -0,0 +1,40 @@
+package app
+
+import (
+	"os"
+	"sort"
+	"strings"
+)
+
+func readWildcardObservedHostsContent() string {
+	data, err := os.ReadFile(lastIPsMapDyn)
+	if err != nil {
+		return ""
+	}
+	seen := make(map[string]struct{})
+	out := make([]string, 0, 256)
+	for _, ln := range strings.Split(string(data), "\n") {
+		ln = strings.TrimSpace(ln)
+		if ln == "" || strings.HasPrefix(ln, "#") {
+			continue
+		}
+		fields := strings.Fields(ln)
+		if len(fields) < 2 {
+			continue
+		}
+		host := strings.TrimSpace(fields[1])
+		if host == "" || strings.HasPrefix(host, "[") {
+			continue
+		}
+		if _, ok := seen[host]; ok {
+			continue
+		}
+		seen[host] = struct{}{}
+		out = append(out, host)
+	}
+	sort.Strings(out)
+	if len(out) == 0 {
+		return ""
+	}
+	return strings.Join(out, "\n") + "\n"
+}