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/web/src/SiteSettings.tsx

@@ -21,6 +21,7 @@ export function SiteSettings({ canEdit }: { canEdit: boolean }) {
   const [occ, setOcc] = useState<Occupancy | null>(null);
   const [capInput, setCapInput] = useState("");
   const [meta, setMeta] = useState<Record<string, string>>({});
+  const [exitVoucherDefault, setExitVoucherDefault] = useState(false);
   const [msg, setMsg] = useState<string | null>(null);
 
   function reload() {
@@ -31,6 +32,7 @@ export function SiteSettings({ canEdit }: { canEdit: boolean }) {
     fetchSiteConfig()
       .then((c) => {
         setCapInput(c.capacity == null ? "" : String(c.capacity));
+        setExitVoucherDefault(c.exitVoucherDefault);
         const m: Record<string, string> = {};
         for (const { key } of META_FIELDS) m[key] = c[key] == null ? "" : String(c[key]);
         setMeta(m);
@@ -41,7 +43,10 @@ export function SiteSettings({ canEdit }: { canEdit: boolean }) {
   async function save() {
     setMsg(null);
     const raw = capInput.trim();
-    const patch: Partial<SiteConfig> = { capacity: raw === "" ? null : Math.round(Number(raw)) };
+    const patch: Partial<SiteConfig> = {
+      capacity: raw === "" ? null : Math.round(Number(raw)),
+      exitVoucherDefault,
+    };
     // Send each metadata field; "" → null is applied server-side.
     for (const { key } of META_FIELDS) (patch as Record<string, string | null>)[key] = meta[key] ?? "";
     try {
@@ -75,6 +80,17 @@ export function SiteSettings({ canEdit }: { canEdit: boolean }) {
             Capacity (blank = no limit):{" "}
             <input value={capInput} onChange={(e) => setCapInput(e.target.value)} style={{ width: 80 }} placeholder="e.g. 120" />
           </label>
+          <label style={{ display: "flex", alignItems: "center", gap: "0.4rem" }}>
+            <input
+              type="checkbox"
+              checked={exitVoucherDefault}
+              onChange={(e) => setExitVoucherDefault(e.target.checked)}
+            />
+            Print exit ticket by default
+            <span style={{ color: "#888", fontSize: "0.8rem" }}>
+              (booth far from exit → customer self-exits with a voucher)
+            </span>
+          </label>
           <div style={{ borderTop: "1px solid #eee", paddingTop: "0.5rem", color: "#666", fontSize: "0.85rem" }}>
             Park details (optional — shown on tickets/receipts)
           </div>