v0.318.0: the internal data place, partitions, an honest whole-box backup offer (R-1084), sys_drive never offered (R-1082)

felhom.eu architecture/16 §4-§6 (build B). MinAgent 0.157.0 — the internal place and the partitions appear only when
agent >= 0.158.0 reports them. Tests red-proved; four parity fixtures refreshed (only the new lines).

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

controller/internal/i18n/locales/en.json

@@ -1362,6 +1362,12 @@
   "err.stacks.ellenorzes_sikertelen_mentes": "the check failed (%s backup): %s",
   "err.stacks.field_required": "the %q (%s) field has to be filled in",
   "err.stacks.needs_drive": "This app needs a storage drive. You can add one on the Storage → Drives page.",
+  "storage_wizard.resz_n": "part {n}",
+  "err.web.meghajto_hasznalatban_formazas": "This disk holds a drive that is in use, so the whole disk cannot be formatted. You can format only its free part.",
+  "storage.belso_tarhely_magyarazat": "It is on the machine's own disk, but it is not part of the full system backup. A different disk or the off-site backup protects against a disk failure.",
+  "backup.target.offer_unproven": "You can choose this drive as the place for the system backup. Felhom cannot check that this drive is really a different disk (inside a virtual machine and behind some USB enclosures this is not visible), so we cannot promise that you can restore the system after a disk failure.",
+  "storage.belso_tarhely": "Internal storage",
+  "err.web.belso_tarhely_eletciklus": "The internal storage is on the disk of the machine itself, so it cannot be removed, retired or formatted. You can move its data to another drive.",
   "err.stacks.field_required_password": "the %q field has to be filled in — use the Generate button, or type a password",
   "err.stacks.forras_nevter_olvasasa_sikertelen": "reading the source folder failed: %s",
   "err.stacks.forras_torlese_sikertelen": "removing the source failed (%s): %s",