feat(api): 升级开放 API 并支持投递回调

- 为 `/api/open/v1` 引入 Token scope、分页游标、幂等发信、发送事件与重试/取消能力。
- 新增投递事件签名回调与状态 webhook outbox，补充相关配置、迁移和测试。
- 同步更新 Web 端 API 类型、个人中心 Token 权限管理，以及中英文文档和 OpenAPI 契约。

apps/api/internal/app/admin_handlers.go

@@ -964,7 +964,7 @@ func (a *App) handleCreateAlias(w http.ResponseWriter, r *http.Request) {
 		source = normalizeLocalPart(source) + "@" + domain.Name
 	}
 	destination := normalizeEmail(req.Destination)
-	if source == "" || destination == "" || !strings.Contains(destination, "@") {
+	if source == "" || !strings.HasSuffix(source, "@"+domain.Name) || destination == "" || !strings.Contains(destination, "@") {
 		badRequest(w, errors.New("invalid alias"))
 		return
 	}
@@ -1009,7 +1009,7 @@ func (a *App) handleUpdateAlias(w http.ResponseWriter, r *http.Request) {
 		source = normalizeLocalPart(source) + "@" + domain.Name
 	}
 	destination := normalizeEmail(req.Destination)
-	if source == "" || destination == "" || !strings.Contains(destination, "@") {
+	if source == "" || !strings.HasSuffix(source, "@"+domain.Name) || destination == "" || !strings.Contains(destination, "@") {
 		badRequest(w, errors.New("invalid alias"))
 		return
 	}