feat: admin settings (accounts, system, notification, audit)

backend/src/main/java/com/srsystem/controller/SystemConfigController.java

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+package com.srsystem.controller;
+
+import com.srsystem.entity.SystemConfig;
+import com.srsystem.repository.SystemConfigRepository;
+import com.srsystem.dto.ApiResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.web.bind.annotation.*;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/v1/admin/config")
+@PreAuthorize("hasRole('ADMIN')")
+@RequiredArgsConstructor
+public class SystemConfigController {
+
+    private final SystemConfigRepository repository;
+
+    @GetMapping
+    public ApiResponse<List<SystemConfig>> getAll() {
+        return ApiResponse.ok(repository.findAll());
+    }
+
+    @GetMapping("/{key}")
+    public ApiResponse<SystemConfig> getByKey(@PathVariable String key) {
+        return repository.findByConfigKey(key)
+                .map(ApiResponse::ok)
+                .orElse(ApiResponse.error("설정을 찾을 수 없습니다: " + key));
+    }
+
+    @PutMapping("/{key}")
+    public ApiResponse<SystemConfig> update(@PathVariable String key, @RequestBody Map<String, String> body) {
+        String value = body.get("configValue");
+        if (value == null) {
+            return ApiResponse.error("configValue가 필요합니다.");
+        }
+        SystemConfig config = repository.findByConfigKey(key).orElse(null);
+        if (config == null) {
+            config = SystemConfig.builder().configKey(key).createdAt(LocalDateTime.now()).build();
+        }
+        config.setConfigValue(value);
+        config.setUpdatedAt(LocalDateTime.now());
+        return ApiResponse.ok(repository.save(config));
+    }
+
+    @PutMapping("/batch")
+    public ApiResponse<List<SystemConfig>> batchUpdate(@RequestBody Map<String, String> entries) {
+        entries.forEach((k, v) -> {
+            SystemConfig config = repository.findByConfigKey(k).orElse(null);
+            if (config == null) {
+                config = SystemConfig.builder().configKey(k).createdAt(LocalDateTime.now()).build();
+            }
+            config.setConfigValue(v);
+            config.setUpdatedAt(LocalDateTime.now());
+            repository.save(config);
+        });
+        return ApiResponse.ok(repository.findAll());
+    }
+}

backend/src/main/java/com/srsystem/entity/SystemConfig.java

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+package com.srsystem.entity;
+
+import jakarta.persistence.*;
+import lombok.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "tb_system_config")
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class SystemConfig {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seq_system_config")
+    @SequenceGenerator(name = "seq_system_config", allocationSize = 50)
+    @Column(name = "config_id")
+    private Long configId;
+
+    @Column(name = "config_key", nullable = false, unique = true, length = 100)
+    private String configKey;
+
+    @Column(name = "config_value", columnDefinition = "TEXT")
+    private String configValue;
+
+    @Column(name = "description", length = 255)
+    private String description;
+
+    @Column(name = "created_at", updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+}

backend/src/main/java/com/srsystem/repository/SystemConfigRepository.java

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+package com.srsystem.repository;
+
+import com.srsystem.entity.SystemConfig;
+import org.springframework.data.jpa.repository.JpaRepository;
+import java.util.Optional;
+
+public interface SystemConfigRepository extends JpaRepository<SystemConfig, Long> {
+    Optional<SystemConfig> findByConfigKey(String configKey);
+}

backend/src/main/resources/db/migration/V10__add_system_config.sql

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+CREATE TABLE tb_system_config (
+    config_id BIGSERIAL PRIMARY KEY,
+    config_key VARCHAR(100) NOT NULL UNIQUE,
+    config_value TEXT,
+    description VARCHAR(255),
+    created_at TIMESTAMP,
+    updated_at TIMESTAMP
+);
+
+INSERT INTO tb_system_config (config_key, config_value, description) VALUES
+('sla_check_interval', '3600000', 'SLA 체크 간격 (ms)'),
+('sla_excluded_statuses', 'RESOLVED,CLOSED', 'SLA 제외 티켓 상태'),
+('parking_enabled', 'false', 'Parking 모드 활성화 여부'),
+('parking_weekday_start', '20:00', 'Parking 시작 시간'),
+('parking_weekday_end', '08:00', 'Parking 종료 시간'),
+('parking_weekends', 'true', '주말 Parking 적용'),
+('jwt_access_expiration', '3600000', 'Access Token 만료 시간 (ms)'),
+('jwt_refresh_expiration', '604800000', 'Refresh Token 만료 시간 (ms)'),
+('notification_slack_enabled', 'false', 'Slack 알림 활성화'),
+('notification_email_enabled', 'false', 'Email 알림 활성화'),
+('file_upload_max_size', '10485760', '파일 업로드 최대 크기 (bytes)');