feat(metadata): skip models on offline roots during bulk fetch (#1108)

Bulk metadata refresh picked candidates purely from cache state, so the
entries the scoped scan deliberately keeps for unreachable drives were
fetched anyway — burning CivitAI rate limit on sidecar/preview writes
that cannot land.

- Filter the fetch queue by root reachability (live check via
  describe_model_roots), covering both startup-offline and mid-session
  drive-off; probing failures degrade to no filtering
- Report offline_skipped / offline_roots in the WS terminal payloads,
  the HTTP result and the completion message
- Show a "Drive Offline" stat card in the fetch summary modal when
  any model was skipped this way

locales/de.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "Erfolgreich",
             "statFailed": "Fehlgeschlagen",
             "statSkipped": "Übersprungen",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "Gesamt geprüft",
             "statDuration": "Dauer",
             "successMessage": "Alle {count} {type}s erfolgreich aktualisiert!",

locales/en.json

@@ -2130,6 +2130,7 @@
       "statSuccess": "Success",
       "statFailed": "Failed",
       "statSkipped": "Skipped",
+      "statOffline": "Drive Offline",
       "statTotal": "Total Scanned",
       "statDuration": "Duration",
       "successMessage": "All {count} {type}s updated successfully!",

locales/es.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "Éxito",
             "statFailed": "Fallido",
             "statSkipped": "Omitido",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "Total escaneado",
             "statDuration": "Duración",
             "successMessage": "¡Todos los {count} {type}s actualizados correctamente!",

locales/fr.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "Réussi",
             "statFailed": "Échoué",
             "statSkipped": "Ignoré",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "Total scanné",
             "statDuration": "Durée",
             "successMessage": "Tous les {count} {type}s mis à jour avec succès !",

locales/he.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "הצלחה",
             "statFailed": "נכשל",
             "statSkipped": "דולג",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "סה\"כ נסרק",
             "statDuration": "משך",
             "successMessage": "כל {count} {type}s עודכנו בהצלחה!",

locales/ja.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "成功",
             "statFailed": "失敗",
             "statSkipped": "スキップ",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "スキャン合計",
             "statDuration": "所要時間",
             "successMessage": "すべての{count}件の{type}を正常に更新しました",

locales/ko.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "성공",
             "statFailed": "실패",
             "statSkipped": "건너뜀",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "총 스캔",
             "statDuration": "소요 시간",
             "successMessage": "모든 {count}개 {type}이(가) 성공적으로 업데이트되었습니다",

locales/ru.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "Успешно",
             "statFailed": "Ошибка",
             "statSkipped": "Пропущено",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "Всего проверено",
             "statDuration": "Длительность",
             "successMessage": "Все {count} {type}s успешно обновлены",

locales/zh-CN.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "成功",
             "statFailed": "失败",
             "statSkipped": "已跳过",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "总计扫描",
             "statDuration": "耗时",
             "successMessage": "全部 {count} 个 {type} 更新成功！",

locales/zh-TW.json

@@ -2130,6 +2130,7 @@
             "statSuccess": "成功",
             "statFailed": "失敗",
             "statSkipped": "已跳過",
+            "statOffline": "[TODO: Translate] Drive Offline",
             "statTotal": "總計掃描",
             "statDuration": "耗時",
             "successMessage": "全部 {count} 個 {type} 更新成功！",