3c: partial consumption + undo for cooking sessions

- Append-only undo via correction transactions tied to cookingSessionId.
- POST /v1/cooking-sessions/:id/undo with 24h UTC window (409 + i18n after expiry).
- Complete undo scope: meals removed, meal boxes discarded, recipe_cooks
deleted, cookCount decremented; activation milestones left intact.
- Deterministic assumption-profile rollback via lastSessionAnswers.sessionId;
profile deleted when observationCount reaches 0.
- New status 'undone' as TEXT validated against COOKING_SESSION_STATUSES.
- Analytics event cooking_session_undone + domain events MEAL_BOX_DISCARDED,
MEAL_REMOVED, COOKING_SESSION_UNDONE.
- Partial consumption uses actualPortionsEaten/plannedPortions factor.
- i18n coverage for cooked.undoWindowExpired across all 12 locales + server.
- Invariant tests: computeBalance(transactions) === item.quantity after
complete, undo, and undo + new complete; transaction count increases on undo.
- Migration 0014_expand_event_types.sql adds new enum values.
- Updated FAS3-COOKING-SESSIONS-AUDIT.md with chosen semantics.

apps/mobile/src/locales/de/common.json

@@ -383,5 +383,6 @@
   "scan.diff.noChanges": "Keine Unterschiede gefunden.",
   "scan.diff.undo": "Rückgängig",
   "scan.diff.undoHint": "Jede Änderung kann in der Artikeldetailansicht rückgängig gemacht werden.",
-  "cooked.portionsSumExceedsPlanned": "Gegessene Portionen und Reste dürfen die Gesamtanzahl der Portionen nicht überschreiten."
+  "cooked.portionsSumExceedsPlanned": "Gegessene Portionen und Reste dürfen die Gesamtanzahl der Portionen nicht überschreiten.",
+  "cooked.undoWindowExpired": "Dieser Kochvorgang kann nicht mehr rückgängig gemacht werden. Das 24-Stunden-Fenster ist abgelaufen."
 }