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

selective-vpn-api/app/resolver_precheck_flags.go

@@ -0,0 +1,23 @@
+package app
+
+import (
+	"os"
+	"strings"
+)
+
+func resolvePrecheckForceEnvEnabled() bool {
+	switch strings.ToLower(strings.TrimSpace(os.Getenv("RESOLVE_PRECHECK_FORCE"))) {
+	case "1", "true", "yes", "on":
+		return true
+	default:
+		return false
+	}
+}
+
+func resolvePrecheckForceFileEnabled(path string) bool {
+	if strings.TrimSpace(path) == "" {
+		return false
+	}
+	_, err := os.Stat(path)
+	return err == nil
+}