server: scheduled background jobs

Add node-cron jobs for periodic market price updates, mission
generation, and world event generation; all wired through a central
scheduler module.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/src/jobs/updateMarketPrices.job.ts

@@ -0,0 +1,41 @@
+import { balance } from '../config/gameBalance.js';
+import { prisma } from '../db/prisma.js';
+import { getActiveEvents, priceModifierForCity } from '../modules/events/events.service.js';
+import { clampDemandSupply, computePrices } from '../modules/market/pricing.js';
+import { emitGlobal } from '../realtime/socket.js';
+
+/**
+ * Tick del mercato (ogni minuto): domanda e offerta tornano lentamente
+ * verso l'equilibrio e i prezzi vengono ricalcolati con i modificatori
+ * degli eventi attivi.
+ */
+export async function updateMarketPrices(): Promise<void> {
+  const m = balance.market;
+  const [events, prices] = await Promise.all([
+    getActiveEvents(),
+    prisma.marketPrice.findMany({ include: { item: true, city: true } }),
+  ]);
+
+  const updates = prices.map((price) => {
+    const demand = clampDemandSupply(
+      price.demand * m.decayFactor + m.equilibrium * (1 - m.decayFactor),
+    );
+    const supply = clampDemandSupply(
+      price.supply * m.decayFactor + m.equilibrium * (1 - m.decayFactor),
+    );
+    const next = computePrices(
+      price.item.basePrice,
+      price.city.economyModifier,
+      demand,
+      supply,
+      priceModifierForCity(events, price.cityId),
+    );
+    return prisma.marketPrice.update({
+      where: { cityId_itemId: { cityId: price.cityId, itemId: price.itemId } },
+      data: { demand, supply, buyPrice: next.buyPrice, sellPrice: next.sellPrice },
+    });
+  });
+
+  await prisma.$transaction(updates);
+  emitGlobal('market:updated', { updatedAt: new Date().toISOString() });
+}