feat: 学習カード数の上限を撤廃

REVIEW_CARDS_LIMIT（復習カード80枚制限）とnewCardsPerDay（1日の新規カード制限）
を削除し、期日が来たすべてのカードを制限なく返すように変更。

削除した主な要素:
- REVIEW_CARDS_LIMIT定数とカード取得時のlimitパラメータ
- newCardsPerDayフィールド（DB schema, 型定義, Zod schema, sync, CRDT）
- countDueNewCards, countDueReviewCards, findDueNewCardsForStudy,
  findDueReviewCardsForStudy（CardRepository）
- countTodayNewCardReviews（ReviewLogRepository）
- デッキルートからのReviewLogRepository依存

https://claude.ai/code/session_018hrEJ9vg3RPoeAPyEc17gS

1 files changed, 1 insertions, 20 deletions

diff --git a/src/server/repositories/review-log.ts b/src/server/repositories/review-log.ts
index 97488d2..c8950d6 100644
--- a/src/server/repositories/review-log.ts
+++ b/src/server/repositories/review-log.ts
@@ -1,7 +1,5 @@
-import { and, eq, gte, sql } from "drizzle-orm";
-import { getStartOfStudyDayBoundary } from "../../shared/date.js";
 import { db } from "../db/index.js";
-import { CardState, cards, reviewLogs } from "../db/schema.js";
+import { reviewLogs } from "../db/schema.js";
 import type { ReviewLog, ReviewLogRepository } from "./types.js";
 
 export const reviewLogRepository: ReviewLogRepository = {
@@ -31,21 +29,4 @@ export const reviewLogRepository: ReviewLogRepository = {
 		}
 		return reviewLog;
 	},
-
-	async countTodayNewCardReviews(deckId: string, now: Date): Promise<number> {
-		const startOfDay = getStartOfStudyDayBoundary(now);
-
-		const result = await db
-			.select({ count: sql<number>`count(distinct ${reviewLogs.cardId})::int` })
-			.from(reviewLogs)
-			.innerJoin(cards, eq(reviewLogs.cardId, cards.id))
-			.where(
-				and(
-					eq(cards.deckId, deckId),
-					eq(reviewLogs.state, CardState.New),
-					gte(reviewLogs.reviewedAt, startOfDay),
-				),
-			);
-		return result[0]?.count ?? 0;
-	},
 };