Global code ovehaul - remove CAS and other, add 15 minute greet check

- Remove CAS, as it no longer works for us
- Remove other checks
- Implement 15 minute greet timeout check
- Fix chat logos
- Ditch thirdparty logger, use stdlib log facility wrapper for logging

internal/moon/logOnlyMessage.go

@@ -0,0 +1,24 @@
+package moon
+
+import (
+	"bunny-bot/internal/elog"
+
+	"github.com/NicoNex/echotron/v3"
+)
+
+// logOnlyMessage writes a message to the chat log and nothing else.
+//
+// It handles the messages the greeting detector must NOT count as answers: a photo with no
+// caption, a sticker, a location, a leave, a title change. They are real events in the room
+// and belong in the log — which is also what makes a later ban diagnosable, since a moderator
+// can read what the member actually replied with — but a reply with no text is not an
+// introduction, and recording it in GreetAnswers would let any attachment rescue a spammer
+// from the ban.
+//
+// The dispatcher has already established that this is neither a join nor a text message; it
+// is not re-checked here.
+func logOnlyMessage(msg *echotron.Update) {
+	elog.LogMessage(msg.Message)
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */