feat(conga,lagoon): River and GORM log through diary components

- River's logger is diary.For("river") (warn by default), conga's own lines diary.For("conga"); an app-published logger still wins
- GORM logs through logger.NewSlogLogger(diary.For("db")): warn level, record-not-found ignored, parameterized SQL traces only at verbosity 3
- Smoke tests TestRiverLoggerUsesDiarySmoke and TestGormLoggerUsesDiarySmoke

modules/conga/conga.go

@@ -514,7 +514,7 @@ func (m *Manager) insertOnlyLocked() (*river.Client[*sql.Tx], error) {
 	if !ok || sqlDB == nil {
 		return nil, ErrNoDatabase
 	}
-	c, err := newInsertClient(sqlDB, settingsFromApp(m.app), loggerFromApp(m.app))
+	c, err := newInsertClient(sqlDB, settingsFromApp(m.app), riverLogger(m.app))
 	if err != nil {
 		return nil, fmt.Errorf("conga: river client: %w", err)
 	}