fix: 修复预约相关逻辑

src/main/java/com/petstore/controller/AppointmentController.java

@@ -39,6 +39,16 @@ public class AppointmentController {
         return Map.of("code", 200, "data", appointments);
     }
 
+    /** 预约详情 */
+    @GetMapping("/detail")
+    public Map<String, Object> detail(@RequestParam Long id) {
+        Appointment appointment = appointmentService.getById(id);
+        if (appointment != null) {
+            return Map.of("code", 200, "data", appointment);
+        }
+        return Map.of("code", 404, "message", "预约不存在");
+    }
+
     /** 创建预约 */
     @PostMapping("/create")
     public Map<String, Object> create(@RequestBody Map<String, Object> params) {

src/main/java/com/petstore/service/AppointmentService.java

@@ -33,6 +33,10 @@ public class AppointmentService {
         return appointmentMapper.findByStoreIdAndStatus(storeId, status);
     }
 
+    public Appointment getById(Long id) {
+        return appointmentMapper.findById(id).orElse(null);
+    }
+
     public Appointment create(Appointment appointment) {
         appointment.setCreateTime(LocalDateTime.now());
         appointment.setUpdateTime(LocalDateTime.now());