fix: stop malformed captcha requests from poisoning the page cache

public/typo3conf/ext/ep_theme/Configuration/TypoScript/Extensions/Form.typoscript

@@ -22,3 +22,9 @@ plugin.tx_bwcaptcha.settings {
     width = 220
     height = 60
 }
+
+# Requests with a malformed type (e.g. ?type=03413) bypass the bw_captcha middleware's
+# strict string check and get rendered as this empty PAGE. If it were cacheable, genuine
+# ?type=3413 requests would hit that cache entry, TypoScript would never be parsed and
+# the middleware would crash on empty settings.
+captcha.config.no_cache = 1