docs+feat: record backlog tip and move custom protocols to More

Document delivered IA and backlog four items; put custom plugins under
the wizard More group per design.

backend/internal/api/logapi.go

@@ -182,6 +182,9 @@ func (s *Server) exportConnectionLogs(c *gin.Context) {
 			q = q.Where("tunnel_id = ?", tid)
 		}
 	}
+	if v := c.Query("keyword"); v != "" {
+		q = q.Where("(detail LIKE ? OR ip_address LIKE ?)", "%"+v+"%", "%"+v+"%")
+	}
 	if v := c.Query("start"); v != "" {
 		if t, err := time.Parse("2006-01-02", v); err == nil {
 			q = q.Where("created_at >= ?", t)