feat(api): add dueToday endpoint, shared DUE_WHERE constant, and commit rung handling

apps/api/src/stats.ts

@@ -7,6 +7,7 @@
 import {
   CAMPAIGN_DAYS,
   CAMPAIGN_START,
+  DUE_WHERE,
   addDays,
   campaignDay,
   campaignWeek,
@@ -78,11 +79,7 @@ export async function buildStats(db: D1Database, today: string): Promise<object>
   for (let i = 0; i < 14; i++) {
     const date = addDays(today, i);
     const row = await db
-      .prepare(
-        `SELECT COUNT(*) AS n FROM problems
-         WHERE stage != 'retired' AND next_review IS NOT NULL AND next_review <= ?1
-           AND (defer_until IS NULL OR defer_until <= ?1)`,
-      )
+      .prepare(`SELECT COUNT(*) AS n FROM problems WHERE ${DUE_WHERE}`)
       .bind(date)
       .first<{ n: number }>();
     queue.push({ date, due: row?.n ?? 0 });