feat(deck): add daily learning limits and today's study stats

- Add newPerDay and revPerDay fields to Deck model (Anki-style)
- Add settings modal to configure daily limits per deck
- Display today's studied counts (new/review/learning) on deck page
- Add i18n translations for all 8 languages
- Fix JSON syntax errors in fr-FR.json and it-IT.json
- Fix double counting bug in repoGetTodayStudyStats

src/modules/deck/deck-service.ts

@@ -59,6 +59,8 @@ export async function serviceUpdateDeck(input: ServiceInputUpdateDeck): Promise<
       desc: input.desc,
       visibility: input.visibility,
       collapsed: input.collapsed,
+      newPerDay: input.newPerDay,
+      revPerDay: input.revPerDay,
     });
     log.info("Deck updated successfully", { deckId: input.deckId });
     return { success: true, message: "Deck updated successfully" };