feat(ticket): 新增单程票购票与检票功能，优化日志与接口

- 前端新增单程票购票界面，支持票种切换与区间选择、价格预览
- 完善后端检票接口，添加单程票的校验与处理逻辑
- 优化售票机脚本的车票类型映射，新增单程车票支持
- 简化前端售票日志输出，移除冗余站点信息字段
- 新增服务层付费区间计算字段，优化公共接口返回数据

server/routes/api.js

@@ -1336,18 +1336,23 @@ router.post('/tickets/check', async (req, res) => {
     toFiniteNumberOrUndef(hintTripsRemaining);
   const tripsRemainEffective = (tripsRemain0 == null) ? tripsTotal : tripsRemain0;
 
+  const isSingleTicket = String(cur.train_type || '').toLowerCase() === 'single';
+
   if (action === 'entry') {
-    if (!matchesStation(start)) return deny('wrong_station');
+    if (!isSingleTicket && !matchesStation(start)) return deny('wrong_station');
     if (entered && !exited) return deny('already_entered');
 
-    const ev = { ts, type: 'check', ticket_id, action, result: 'pass', station_code: start, station_name: resolveStationName(start), device };
+    const entryCode = isSingleTicket ? (station_code_raw || start) : start;
+
+    const ev = { ts, type: 'check', ticket_id, action, result: 'pass', station_code: entryCode, station_name: resolveStationName(entryCode), device };
     await DataService.appendTicketEvent(ev);
     await DataService.upsertTicketIndex({
       ticket_id,
       entered: true,
       exited: false,
       last_action: 'entry',
-      last_station_code: start,
+      last_station_code: entryCode,
+      start: isSingleTicket ? entryCode : cur.start,
       last_result: 'pass',
       last_reason: '',
       last_event: 'check',
@@ -1357,22 +1362,31 @@ router.post('/tickets/check', async (req, res) => {
     });
     io.emit('ticket:check', ev);
     appendReqLog(req, { category: 'device', type: 'ticket_check', detail: ev });
-    return res.json({ ok: true, ticket_id, action, result: 'pass', station_code: start, trips_remaining: tripsRemainEffective, destroy_ticket: false });
+    return res.json({ ok: true, ticket_id, action, result: 'pass', station_code: entryCode, trips_remaining: tripsRemainEffective, destroy_ticket: false });
+  }
+
+  const exitCode = station_code_raw || terminal;
+  if (isSingleTicket) {
+    const fareInfo = LogicService.computeFareBoth(cur.start, exitCode);
+    if (!fareInfo || fareInfo.paid_segments !== 1) {
+      return deny('非单区间');
+    }
+  } else {
+    if (!matchesStation(terminal)) return deny('wrong_station');
   }
 
-  if (!matchesStation(terminal)) return deny('wrong_station');
   if (!entered) return deny('not_entered');
   if (exited) return deny('already_exited');
 
   const newTripsRemaining = Math.max(0, (Number(tripsRemainEffective) || 0) - 1);
-  const shouldSetUsed = newTripsRemaining <= 0;
-  const ev = { ts, type: 'check', ticket_id, action, result: 'pass', station_code: terminal, station_name: resolveStationName(terminal), device, trips_remaining: newTripsRemaining };
+  const shouldSetUsed = isSingleTicket ? true : (newTripsRemaining <= 0);
+  const ev = { ts, type: 'check', ticket_id, action, result: 'pass', station_code: exitCode, station_name: resolveStationName(exitCode), device, trips_remaining: newTripsRemaining };
   await DataService.appendTicketEvent(ev);
   await DataService.upsertTicketIndex({
     ticket_id,
     exited: true,
     last_action: 'exit',
-    last_station_code: terminal,
+    last_station_code: exitCode,
     last_result: 'pass',
     last_reason: '',
     last_event: 'check',
@@ -1383,7 +1397,7 @@ router.post('/tickets/check', async (req, res) => {
   });
   io.emit('ticket:check', ev);
   appendReqLog(req, { category: 'device', type: 'ticket_check', detail: ev });
-  return res.json({ ok: true, ticket_id, action, result: 'pass', station_code: terminal, trips_remaining: newTripsRemaining, destroy_ticket: shouldSetUsed });
+  return res.json({ ok: true, ticket_id, action, result: 'pass', station_code: exitCode, trips_remaining: newTripsRemaining, destroy_ticket: shouldSetUsed });
 });
 
 router.post('/tickets/status', async (req, res) => {