feat: sync visible product branding

Sync telesrv c779c48 (feat(branding): unify visible product naming).

Skipped private www files and preserved public README files; mapped orange appearance seed names to public default names.

internal/branding/branding.go

@@ -0,0 +1,95 @@
+// Package branding owns the user-visible telesrv product identity.
+//
+// Protocol identifiers, client detection tokens and third-party compatibility
+// headers do not belong here: callers must only pass text that is rendered to
+// an end user.
+package branding
+
+import (
+	"net/url"
+	"regexp"
+	"strings"
+)
+
+const (
+	ProductName      = "Telesrv"
+	ProductUsername  = "telesrv"
+	DesktopAppName   = "Telesrv Desktop"
+	AndroidAppName   = "Telesrv Android"
+	IOSAppName       = "Telesrv iOS"
+	MacOSAppName     = "Telesrv macOS"
+	WebAAppName      = "Telesrv Web A"
+	WebKAppName      = "Telesrv Web K"
+	PremiumName      = "Telesrv Premium"
+	StarsName        = "Telesrv Stars"
+	DefaultPublicURL = "https://telesrv.net"
+)
+
+// ClientAppName returns the branded display name for a stored client platform.
+// Stored detection tokens remain unchanged; this is only used at presentation
+// boundaries such as account.getAuthorizations.
+func ClientAppName(platform string) string {
+	switch strings.ToLower(strings.TrimSpace(platform)) {
+	case "android":
+		return AndroidAppName
+	case "ios":
+		return IOSAppName
+	case "macos":
+		return MacOSAppName
+	case "telegram-tt", "weba":
+		return WebAAppName
+	case "tweb", "webk":
+		return WebKAppName
+	case "tdesktop", "desktop", "windows":
+		return DesktopAppName
+	default:
+		return ProductName
+	}
+}
+
+// UserVisibleClientPlatform hides internal compatibility tokens from the
+// authorization UI without changing their durable representation.
+func UserVisibleClientPlatform(platform string) string {
+	if strings.EqualFold(strings.TrimSpace(platform), "telegram-tt") {
+		return "weba"
+	}
+	return UserVisibleText(platform, "")
+}
+
+var (
+	officialHTTPHostRE = regexp.MustCompile(`(?i)https?://(?:[a-z0-9-]+\.)*(?:telegram\.(?:org|me|com|dog)|t\.me)([^a-z0-9]|$)`)
+	officialBareHostRE = regexp.MustCompile(`(?i)(?:(?:[a-z0-9-]+\.)*telegram\.(?:org|me|com|dog)|\bt\.me)([^a-z0-9]|$)`)
+	officialBrandRE    = regexp.MustCompile(`(?i)telegram|телеграм[\p{L}]*|تيليجرام|تلگرام|텔레그램|טלגרם`)
+	technicalIDRE      = regexp.MustCompile(`^[A-Za-z0-9-]+(?:[._][A-Za-z0-9-]+)+$`)
+)
+
+// UserVisibleText replaces the official product brand and its public hosts in
+// text returned to clients. Placeholder syntax, markup and string keys are
+// deliberately untouched by callers; only values should pass through here.
+func UserVisibleText(value, publicBaseURL string) string {
+	if value == "" {
+		return ""
+	}
+	baseURL, publicHost := publicDestination(publicBaseURL)
+	value = officialHTTPHostRE.ReplaceAllString(value, baseURL+"${1}")
+	value = officialBareHostRE.ReplaceAllString(value, publicHost+"${1}")
+	// Some platform packs carry dotted or underscored runtime identifiers as
+	// values. They are not copy and changing them can break client navigation.
+	if technicalIDRE.MatchString(value) {
+		return value
+	}
+	return officialBrandRE.ReplaceAllString(value, ProductName)
+}
+
+func publicDestination(raw string) (string, string) {
+	raw = strings.TrimRight(strings.TrimSpace(raw), "/")
+	if raw == "" {
+		raw = DefaultPublicURL
+	}
+	parsed, err := url.Parse(raw)
+	if err != nil || parsed.Scheme == "" || parsed.Hostname() == "" {
+		raw = DefaultPublicURL
+		parsed, _ = url.Parse(raw)
+	}
+	return raw, parsed.Host
+}