server: API — expose mapX/mapY in cities and basePrice in market

Cities endpoint now returns map coordinates for the SVG map renderer.
Market endpoint includes basePrice so the client can compute price
trend deltas relative to the item base value.

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

server/src/modules/cities/cities.routes.ts

@@ -14,6 +14,8 @@ const citySelect = {
   riskLevel: true,
   policePressure: true,
   economyModifier: true,
+  mapX: true,
+  mapY: true,
 } as const;
 
 export const citiesRoutes: FastifyPluginAsync = async (app) => {

server/src/modules/market/market.service.ts

@@ -48,6 +48,7 @@ export async function getCurrentMarket(playerId: string) {
       name: p.item.name,
       buyPrice: p.buyPrice,
       sellPrice: p.sellPrice,
+      basePrice: p.item.basePrice,
       demand: p.demand,
       supply: p.supply,
       rarity: p.item.rarity,