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_database_export_test.go

@@ -166,6 +166,7 @@ func TestArchiveExport_MatchesStoredRows(t *testing.T) {
 			WebhookID:    exportWebhookID,
 			EntrypointID: "ep-1",
 			Method:       "POST",
+			RawQuery:     eventQuery,
 			Headers:      `{"X-Test":["yes"]}`,
 			Body:         body,
 			ContentType:  testContentType,
@@ -215,12 +216,13 @@ func assertExportedRow(
 	assert.Equal(t, row.WebhookID, ev["webhook_id"])
 	assert.Equal(t, row.EntrypointID, ev["entrypoint_id"])
 	assert.Equal(t, row.Method, ev["method"])
+	assert.Equal(t, row.RawQuery, ev["raw_query"])
 	assert.Equal(t, row.Headers, ev["headers"])
 	assert.Equal(t, row.ContentType, ev["content_type"])
 
 	if row.Body != binaryBody {
 		assert.Equal(t, row.Body, ev["body"])
-		assert.Len(t, ev, 9, "the nine columns and nothing else: %v", ev)
+		assert.Len(t, ev, 10, "the ten columns and nothing else: %v", ev)
 
 		return
 	}
@@ -229,7 +231,7 @@ func assertExportedRow(
 	require.NoError(t, err)
 	assert.Equal(t, binaryBody, string(body))
 	assert.Equal(t, "base64", ev["body_encoding"])
-	assert.Len(t, ev, 10, "the nine columns and body_encoding: %v", ev)
+	assert.Len(t, ev, 11, "the ten columns and body_encoding: %v", ev)
 }
 
 // TestArchiveExport_Empty proves an archive with nothing in it exports