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- 新增版本发布状态管理 (draft/published/deprecated/superseded)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>

frontend/src/plugins/i18n/en.json

@@ -1415,6 +1415,15 @@
       "batchExportBtn": "Batch Export",
       "batchDeleteConfirm": "Are you sure you want to delete {count} selected versions? This action cannot be undone.",
       "batchDeleteSuccess": "Batch delete successful",
+      "publishTitle": "Publish Version",
+      "publishConfirm": "Are you sure you want to publish version \"v{version}\"? This will make it available to users.",
+      "publishSuccess": "Version published successfully",
+      "deprecateTitle": "Deprecate Version",
+      "deprecateConfirm": "Are you sure you want to deprecate version \"v{version}\"? This will stop distributing it to users.",
+      "deprecateSuccess": "Version deprecated successfully",
+      "rollbackTitle": "Rollback Version",
+      "rollbackConfirm": "Are you sure you want to rollback version \"v{version}\"? This will restore it to published status.",
+      "rollbackSuccess": "Version rolled back successfully",
       "select": "Select",
       "columns": {
         "version": "Version",
@@ -1425,9 +1434,19 @@
         "type": "Type",
         "method": "Method",
         "status": "Status",
+        "deltaPackage": "Delta",
         "createdAt": "Created At",
         "actions": "Actions"
       },
+      "actions": {
+        "download": "Download",
+        "downloadDelta": "Download Delta",
+        "edit": "Edit",
+        "delete": "Delete",
+        "publish": "Publish",
+        "deprecate": "Deprecate",
+        "rollback": "Rollback"
+      },
       "strategies": {
         "optional": "Optional",
         "forced": "Forced"
@@ -1441,8 +1460,11 @@
         "manual": "Manual Update"
       },
       "status": {
-        "active": "Active",
-        "superseded": "Superseded"
+        "draft": "Draft",
+        "published": "Published",
+        "deprecated": "Deprecated",
+        "superseded": "Superseded",
+        "active": "Active"
       },
       "createForm": {
         "title": "Create Version",

frontend/src/plugins/i18n/zh.json

@@ -1393,6 +1393,15 @@
       "batchExportBtn": "批量导出",
       "batchDeleteConfirm": "确定要删除选中的 {count} 个版本吗？此操作不可撤销。",
       "batchDeleteSuccess": "批量删除成功",
+      "publishTitle": "发布版本",
+      "publishConfirm": "确定要发布版本「v{version}」吗？发布后将分发给用户。",
+      "publishSuccess": "版本发布成功",
+      "deprecateTitle": "废弃版本",
+      "deprecateConfirm": "确定要废弃版本「v{version}」吗？废弃后将停止分发给用户。",
+      "deprecateSuccess": "版本废弃成功",
+      "rollbackTitle": "回滚版本",
+      "rollbackConfirm": "确定要回滚版本「v{version}」吗？回滚后将恢复为已发布状态。",
+      "rollbackSuccess": "版本回滚成功",
       "select": "选择",
       "columns": {
         "version": "版本号",
@@ -1403,9 +1412,19 @@
         "type": "更新类型",
         "method": "更新方式",
         "status": "状态",
+        "deltaPackage": "增量包",
         "createdAt": "创建时间",
         "actions": "操作"
       },
+      "actions": {
+        "download": "下载",
+        "downloadDelta": "下载增量包",
+        "edit": "编辑",
+        "delete": "删除",
+        "publish": "发布",
+        "deprecate": "废弃",
+        "rollback": "回滚"
+      },
       "strategies": {
         "optional": "可选更新",
         "forced": "强制更新"
@@ -1419,8 +1438,11 @@
         "manual": "手动更新"
       },
       "status": {
-        "active": "有效",
-        "superseded": "已失效"
+        "draft": "草稿",
+        "published": "已发布",
+        "deprecated": "已废弃",
+        "superseded": "已失效",
+        "active": "有效"
       },
       "createForm": {
         "title": "创建版本",