feat: 完善版本管理功能

后端改进:
- 新增版本发布状态管理 (draft/published/deprecated/superseded)
- 新增发布/废弃/回滚 API 接口
- 新增增量包生成功能 (仅包含差异文件)
- 新增删除版本时的依赖检查
- 数据库字段: publish_status, superseded_by, delta_package_*

前端改进:
- 版本列表新增发布状态列和增量包大小列
- 新增发布/废弃/回滚操作按钮
- 新增增量包下载功能
- 更新国际化翻译

修复:
- 修复 announcements 页面 typeOptions 未定义问题
- 修复 echarts 模块导入类型问题

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/internal/model/models.go

@@ -234,17 +234,24 @@ type Version struct {
 	FullPackagePath     string         `gorm:"size:255" json:"full_package_path"`
 	FullPackageSize     int64          `json:"full_package_size"`
 	FullPackageHash     string         `gorm:"size:64" json:"full_package_hash"`
+	DeltaPackagePath    string         `gorm:"size:255" json:"delta_package_path"`
+	DeltaPackageSize    int64          `json:"delta_package_size"`
+	DeltaPackageHash    string         `gorm:"size:64" json:"delta_package_hash"`
 	Description         string         `gorm:"type:text" json:"description"`
 	Changelog           string         `gorm:"type:text" json:"changelog"`
-	Status              string         `gorm:"size:20;default:active" json:"status"`
+	PublishStatus       string         `gorm:"size:20;default:draft;index" json:"publish_status"` // draft, published, deprecated, superseded
+	SupersededBy        *uint          `json:"superseded_by"`
+	PublishedAt         *time.Time     `json:"published_at"`
+	DeprecatedAt        *time.Time     `json:"deprecated_at"`
 	BaseVersionID       *uint          `json:"base_version_id"`
 	CreatedAt           time.Time      `json:"created_at"`
 	UpdatedAt           time.Time      `json:"updated_at"`
 	DeletedAt           gorm.DeletedAt `gorm:"index" json:"-"`
 
-	Application Application    `gorm:"foreignKey:ApplicationID" json:"application,omitempty"`
-	Files       []VersionFile  `gorm:"foreignKey:VersionID" json:"files,omitempty"`
-	BaseVersion *Version       `gorm:"foreignKey:BaseVersionID" json:"base_version,omitempty"`
+	Application  Application   `gorm:"foreignKey:ApplicationID" json:"application,omitempty"`
+	Files        []VersionFile `gorm:"foreignKey:VersionID" json:"files,omitempty"`
+	BaseVersion  *Version      `gorm:"foreignKey:BaseVersionID" json:"base_version,omitempty"`
+	Superseder   *Version      `gorm:"foreignKey:SupersededBy" json:"superseder,omitempty"`
 }
 
 // VersionFile 版本文件模型