feat: rename to Vibe; relax password policy

server/internal/api/auth.go

@@ -49,8 +49,8 @@ func (h *apiHandler) register(w http.ResponseWriter, r *http.Request) {
 		writeError(w, http.StatusBadRequest, "display_name must be 1-64 chars")
 		return
 	}
-	if len(req.Password) < 8 || len(req.Password) > 128 {
-		writeError(w, http.StatusBadRequest, "password must be 8-128 chars")
+	if len(req.Password) == 0 || len(req.Password) > 128 {
+		writeError(w, http.StatusBadRequest, "password must be 1-128 chars")
 		return
 	}