feat: Swagger API 문서 추가 + 보스레이드/플레이어 레벨 시스템

- swaggo/swag 기반 전체 API 엔드포인트 Swagger 어노테이션 (59개)
- /swagger/ 경로에 Swagger UI 제공
- 보스레이드 데디서버 관리 (등록, 하트비트, 슬롯 리셋)
- 플레이어 레벨/경험치 시스템 및 스탯 성장

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/bossraid/model.go

@@ -32,3 +32,41 @@ type BossRoom struct {
 	StartedAt   *time.Time     `json:"startedAt,omitempty"`
 	CompletedAt *time.Time     `json:"completedAt,omitempty"`
 }
+
+// SlotStatus represents the status of a dedicated server room slot.
+type SlotStatus string
+
+const (
+	SlotIdle       SlotStatus = "idle"
+	SlotWaiting    SlotStatus = "waiting"
+	SlotInProgress SlotStatus = "in_progress"
+)
+
+
+// DedicatedServer represents a server group (e.g., "Dedi1").
+// Multiple containers (replicas) share the same server group name.
+type DedicatedServer struct {
+	ID         uint           `json:"id"         gorm:"primaryKey"`
+	CreatedAt  time.Time      `json:"createdAt"`
+	UpdatedAt  time.Time      `json:"updatedAt"`
+	DeletedAt  gorm.DeletedAt `json:"-"          gorm:"index"`
+	ServerName string         `json:"serverName" gorm:"type:varchar(100);uniqueIndex;not null"`
+	MaxRooms   int            `json:"maxRooms"   gorm:"default:10;not null"`
+}
+
+// RoomSlot represents a room slot on a dedicated server.
+// Each slot has a stable session name that the Fusion NetworkRunner uses.
+// InstanceID tracks which container process currently owns this slot.
+type RoomSlot struct {
+	ID                uint           `json:"id"                gorm:"primaryKey"`
+	CreatedAt         time.Time      `json:"createdAt"`
+	UpdatedAt         time.Time      `json:"updatedAt"`
+	DeletedAt         gorm.DeletedAt `json:"-"                 gorm:"index"`
+	DedicatedServerID uint           `json:"dedicatedServerId" gorm:"index;not null"`
+	SlotIndex         int            `json:"slotIndex"         gorm:"not null"`
+	SessionName       string         `json:"sessionName"       gorm:"type:varchar(100);uniqueIndex;not null"`
+	Status            SlotStatus     `json:"status"            gorm:"type:varchar(20);index;default:idle;not null"`
+	BossRoomID        *uint          `json:"bossRoomId"        gorm:"index"`
+	InstanceID        string         `json:"instanceId"        gorm:"type:varchar(100);index"`
+	LastHeartbeat     *time.Time     `json:"lastHeartbeat"`
+}