fix anthropic RWPX

internal/handler/anthropic.go

@@ -28,8 +28,12 @@ func HandleMessages(w http.ResponseWriter, r *http.Request) {
 		writeAnthropicError(w, http.StatusUnauthorized, "authentication_error", "Missing API key")
 		return
 	}
-
-	if token == "free" {
+	ok, reason := CheckAndTrack(token, 0)
+	if !ok {
+		writeAnthropicError(w, http.StatusTooManyRequests, "rate_limit_error", reason)
+		return
+	}
+	if token == "free" || strings.HasPrefix(token, "RWPX-") {
 		anonymousToken, err := auth.GetAnonymousToken()
 		if err != nil {
 			logger.LogError("Failed to get anonymous token: %v", err)