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

selective-vpn-api/app/transport_singbox_dns_migration_rules.go

@@ -0,0 +1,35 @@
+package app
+
+func transportAppendDNSRule(rawDNS map[string]any, rule map[string]any) {
+	if rawDNS == nil || len(rule) == 0 {
+		return
+	}
+	rawRules, _ := rawDNS["rules"].([]any)
+	for _, it := range rawRules {
+		existing, ok := it.(map[string]any)
+		if !ok || existing == nil {
+			continue
+		}
+		if mapsEqual(existing, rule) {
+			return
+		}
+	}
+	rawRules = append(rawRules, rule)
+	rawDNS["rules"] = rawRules
+}
+
+func mapsEqual(a, b map[string]any) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for k, av := range a {
+		bv, ok := b[k]
+		if !ok {
+			return false
+		}
+		if asString(av) != asString(bv) {
+			return false
+		}
+	}
+	return true
+}