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_edit.go

@@ -39,6 +39,9 @@ type TargetConfigForm struct {
 	// Timeout is the HTTP target's per-request timeout in seconds,
 	// empty when unset.
 	Timeout string
+	// ForwardQuery is the HTTP target's setting that passes each
+	// event's query string on to it.
+	ForwardQuery bool
 	// Expiry is the database (archive) target's row expiry.
 	Expiry string
 	// Rotation is the database (archive) target's rotation.
@@ -64,9 +67,10 @@ func NewTargetConfigForm(
 		}
 
 		return TargetConfigForm{
-			URL:     cfg.URL,
-			Headers: FormatTargetHeaders(cfg.Headers),
-			Timeout: FormatTargetTimeout(cfg.Timeout),
+			URL:          cfg.URL,
+			Headers:      FormatTargetHeaders(cfg.Headers),
+			Timeout:      FormatTargetTimeout(cfg.Timeout),
+			ForwardQuery: cfg.ForwardQuery,
 		}, nil
 	case database.TargetTypeSlack:
 		cfg, err := parseSlackConfig(t.Config)