feat: 공지사항 API 추가

src/main/java/me/thinkcat/opic/practice/config/security/SecurityConfig.java

@@ -38,7 +38,8 @@ public class SecurityConfig {
             "/actuator/**",
             "/api/v1/answers/internal/**",
             "/api/v1/questions/internal/**",
-            "/api/v1/drill-answers/internal/**"
+            "/api/v1/drill-answers/internal/**",
+            "/api/v1/notices/**"
     };
 
     @Bean

src/main/java/me/thinkcat/opic/practice/controller/NoticeController.java

@@ -0,0 +1,32 @@
+package me.thinkcat.opic.practice.controller;
+
+import lombok.RequiredArgsConstructor;
+import me.thinkcat.opic.practice.dto.CommonResponse;
+import me.thinkcat.opic.practice.dto.response.NoticeResponse;
+import me.thinkcat.opic.practice.service.NoticeService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/v1/notices")
+@RequiredArgsConstructor
+public class NoticeController {
+
+    private final NoticeService noticeService;
+
+    @GetMapping
+    public ResponseEntity<CommonResponse<List<NoticeResponse>>> getNotices() {
+        List<NoticeResponse> notices = noticeService.getNotices();
+        return ResponseEntity.ok(
+                CommonResponse.<List<NoticeResponse>>builder()
+                        .success(true)
+                        .result(notices)
+                        .message("Notices retrieved successfully")
+                        .build()
+        );
+    }
+}

src/main/java/me/thinkcat/opic/practice/dto/mapper/NoticeMapper.java

@@ -0,0 +1,18 @@
+package me.thinkcat.opic.practice.dto.mapper;
+
+import me.thinkcat.opic.practice.dto.response.NoticeResponse;
+import me.thinkcat.opic.practice.entity.Notice;
+
+public class NoticeMapper {
+
+    private NoticeMapper() {}
+
+    public static NoticeResponse toResponse(Notice notice) {
+        return NoticeResponse.builder()
+                .id(notice.getId())
+                .title(notice.getTitle())
+                .content(notice.getContent())
+                .createdAt(notice.getCreatedAt())
+                .build();
+    }
+}

src/main/java/me/thinkcat/opic/practice/dto/response/NoticeResponse.java

@@ -0,0 +1,15 @@
+package me.thinkcat.opic.practice.dto.response;
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Builder
+public class NoticeResponse {
+    private Long id;
+    private String title;
+    private String content;
+    private LocalDateTime createdAt;
+}

src/main/java/me/thinkcat/opic/practice/entity/Notice.java

@@ -0,0 +1,25 @@
+package me.thinkcat.opic.practice.entity;
+
+import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.annotations.Where;
+
+@Entity
+@Table(name = "notices")
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+@Where(clause = "deleted_at IS NULL")
+public class Notice extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false, length = 200)
+    private String title;
+
+    @Column(nullable = false, columnDefinition = "TEXT")
+    private String content;
+}

src/main/java/me/thinkcat/opic/practice/repository/NoticeRepository.java

@@ -0,0 +1,10 @@
+package me.thinkcat.opic.practice.repository;
+
+import me.thinkcat.opic.practice.entity.Notice;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface NoticeRepository extends JpaRepository<Notice, Long> {
+    List<Notice> findAllByOrderByCreatedAtDesc();
+}

src/main/java/me/thinkcat/opic/practice/service/NoticeService.java

@@ -0,0 +1,25 @@
+package me.thinkcat.opic.practice.service;
+
+import lombok.RequiredArgsConstructor;
+import me.thinkcat.opic.practice.dto.mapper.NoticeMapper;
+import me.thinkcat.opic.practice.dto.response.NoticeResponse;
+import me.thinkcat.opic.practice.repository.NoticeRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class NoticeService {
+
+    private final NoticeRepository noticeRepository;
+
+    public List<NoticeResponse> getNotices() {
+        return noticeRepository.findAllByOrderByCreatedAtDesc()
+                .stream()
+                .map(NoticeMapper::toResponse)
+                .toList();
+    }
+}