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/delivery/target_config_view_test.go

@@ -223,7 +223,8 @@ func TestNewTargetViews_HTTP(t *testing.T) {
 		Type: database.TargetTypeHTTP,
 		Config: `{"url":"` + viewExampleHook + `",` +
 			`"timeout":30,` +
-			`"headers":{"Authorization":"Bearer sekrit"}}`,
+			`"headers":{"Authorization":"Bearer sekrit"},` +
+			`"forwardQuery":true}`,
 		MaxRetries: 5,
 	})
 
@@ -235,6 +236,7 @@ func TestNewTargetViews_HTTP(t *testing.T) {
 			"Destination URL": viewMaskedOrigin,
 			"Timeout":         "30s",
 			"Headers":         "1 configured",
+			"Query string":    "passed on to this target",
 			viewMaxRetries:    "5",
 		},
 		fields,