Store and show an event's query string, and pass it on to an HTTP target when set (closes #312)

The receiver dropped the query string of every request it received, so a sender's URL parameters were silently lost. Each event now keeps it, as sent, in a new `raw_query` column of the per-webhook `events` table; a resubmitted copy carries its original's. The event log and the event's page show it in the shared request block, the event log leaving out one over 32 KiB with a link, as for headers. The archive and log targets carry it. HTTP targets gain "Pass the query string on to this target", off by default: on, deliveries, replays and resubmits append it to the target URL, joined with `&` to one already there. The access log still hides it.

Model: opus-5-5

internal/handlers/target_edit.go

@@ -77,13 +77,14 @@ func (h *Handlers) HandleTargetEdit() http.HandlerFunc {
 		}
 
 		form := targetFormInput{
-			Name:       target.Name,
-			URL:        cfg.URL,
-			Headers:    cfg.Headers,
-			Timeout:    cfg.Timeout,
-			MaxRetries: strconv.Itoa(target.MaxRetries),
-			Expiry:     cfg.Expiry,
-			Rotation:   cfg.Rotation,
+			Name:         target.Name,
+			URL:          cfg.URL,
+			Headers:      cfg.Headers,
+			Timeout:      cfg.Timeout,
+			ForwardQuery: cfg.ForwardQuery,
+			MaxRetries:   strconv.Itoa(target.MaxRetries),
+			Expiry:       cfg.Expiry,
+			Rotation:     cfg.Rotation,
 		}
 
 		h.renderTargetEdit(