feat(booth): pay-on-foot at the booth — ticket lookup, pay, exit, voucher, snapshots

Backend: PayStation.lookup (session view + quote in one read); ExitFlow.exitForBooth
reuses the reader path's paid+grace validation (no booth-only unpaid bypass) and
signs vehicle_exit + pulses an exit relay; printExitVoucher reprints the paid ticket
id barcode; site_config.exit_voucher_default (migration 0002) drives the default.
Routes: GET /api/session/:id, POST /api/exit, POST /api/voucher.

Web: BoothPayModal (entry/now/duration/total, tender, 'Printo biletë dalje'),
SnapshotStrip (entry/exit evidence), api.ts client fns, SiteSettings toggle.

apps/server/src/routes/site.ts

@@ -21,13 +21,21 @@ type TextField = (typeof TEXT_FIELDS)[number];
 interface SiteConfigBody extends Partial<Record<TextField, string | null>> {
   /** Nominal capacity; null = no limit. */
   capacity?: number | null;
+  /** Default for the booth "print exit ticket" checkbox (booth-geography knob). */
+  exitVoucherDefault?: boolean;
 }
 
-/** Shape returned by GET/PUT: capacity + every metadata field (null when unset). */
-type SiteConfig = { capacity: number | null } & Record<TextField, string | null>;
+/** Shape returned by GET/PUT: capacity + the booth flag + every metadata field. */
+type SiteConfig = { capacity: number | null; exitVoucherDefault: boolean } & Record<
+  TextField,
+  string | null
+>;
 
 function toSiteConfig(row: typeof siteConfig.$inferSelect | undefined): SiteConfig {
-  const out = { capacity: row?.capacity ?? null } as SiteConfig;
+  const out = {
+    capacity: row?.capacity ?? null,
+    exitVoucherDefault: row?.exitVoucherDefault ?? false,
+  } as SiteConfig;
   for (const f of TEXT_FIELDS) out[f] = row?.[f] ?? null;
   return out;
 }
@@ -65,6 +73,12 @@ export async function siteRoutes(app: FastifyInstance, db: Db): Promise<void> {
       }
       patch.capacity = c ?? null;
     }
+    if ("exitVoucherDefault" in body) {
+      if (typeof body.exitVoucherDefault !== "boolean") {
+        return reply.code(400).send({ error: "exitVoucherDefault must be a boolean" });
+      }
+      patch.exitVoucherDefault = body.exitVoucherDefault;
+    }
     for (const f of TEXT_FIELDS) {
       if (f in body) patch[f] = normText(body[f]);
     }