fix: API 경로, DB 필드가 잘못되어있던 문제 수정

src/main/java/com/aolda/itda/controller/routing/RoutingController.java

@@ -14,7 +14,7 @@ public class RoutingController {
 
     private final RoutingService routingService;
 
-    @PostMapping("/forwarding")
+    @PostMapping("/routing")
     public ResponseEntity<Object> create(@RequestParam String projectId,
                                          @RequestBody RoutingDTO dto) {
         routingService.createRouting(projectId, dto);

src/main/java/com/aolda/itda/dto/routing/RoutingDTO.java

@@ -25,7 +25,7 @@ public class RoutingDTO {
     @NotBlank
     private String port;
     private Long id;
-    @NotBlank
+    @NotNull
     private Long certificateId;
 
     private LocalDateTime createdAt;

src/main/java/com/aolda/itda/entity/routing/Routing.java

@@ -25,11 +25,11 @@ public class Routing extends BaseTimeEntity {
     private Long routingId;
 
     @OneToOne
-    @JoinColumn(name = "user_id", nullable = false)
+    @JoinColumn(name = "user_id")
     private User user;
 
     @OneToOne
-    @JoinColumn(name = "certificate_id", nullable = false)
+    @JoinColumn(name = "certificate_id")
     private Certificate certificate;
 
     private String projectId;