API 경로에 /api/v1 prefix 추가

- ParticipationController: @RequestMapping("/api/v1") 추가
- WinnerController: @RequestMapping("/api/v1") 추가
- 모든 API 경로가 /api/v1/* 형태로 변경됨

변경된 API 경로:
- POST /api/v1/events/{eventId}/participate
- GET /api/v1/events/{eventId}/participants
- GET /api/v1/events/{eventId}/participants/{participantId}
- POST /api/v1/events/{eventId}/draw-winners
- GET /api/v1/events/{eventId}/winners

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

participation-service/src/main/java/com/kt/event/participation/presentation/controller/ParticipationController.java

@@ -7,11 +7,10 @@ import com.kt.event.participation.application.dto.ParticipationResponse;
 import com.kt.event.participation.application.service.ParticipationService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
-import io.swagger.v3.oas.annotations.tags.Tag;
-import org.springdoc.core.annotations.ParameterObject;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springdoc.core.annotations.ParameterObject;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.web.PageableDefault;
@@ -27,7 +26,7 @@ import org.springframework.web.bind.annotation.*;
  */
 @Slf4j
 @RestController
-@RequestMapping
+@RequestMapping("/api/v1")
 @RequiredArgsConstructor
 public class ParticipationController {
 

participation-service/src/main/java/com/kt/event/participation/presentation/controller/WinnerController.java

@@ -27,7 +27,7 @@ import org.springframework.web.bind.annotation.*;
  */
 @Slf4j
 @RestController
-@RequestMapping
+@RequestMapping("/api/v1")
 @RequiredArgsConstructor
 public class WinnerController {