[Feature request] Option to pass exclude item IDs

Currently my approach to avoid querying duplicated items.

**First**
```
This is be ran every time i called GetRecommend or fetch posts directly from database

for _, item := range postsResponses {
//Feedback is been sent immediately after each query to prevent fetching same posts on next query, the "read" will later be updated to "watched" when watched

postsFeedbacks = append(postsFeedbacks, gClient.Feedback{
FeedbackType: "read",
UserId: utilities.ToStr_fromInt(user_id),
ItemId: utilities.ToStr_fromInt(item.Data.ID),
Value: 0,
Timestamp: appInst.Util.Time.GetNow(),
})
}

if len(postsFeedbacks) != 0 {
appInst.Recommender.GorseClient.InsertFeedback(context.Background(), postsFeedbacks)
}
```
**Then secondly**
```
//Delete all "read" feedback upto an 30 minutes in database in task job
var feedbacks []RecommenderFeedback
db.Table("feedback").Select("user_id, item_id").Where("feedback_type = ? AND updated <= NOW() - INTERVAL ? MINUTE", "read", 30).Limit(10000).Scan(&feedbacks)
for _, f := range feedbacks {
self.instance.Task.Usecase.Session.App.Recommender.GorseClient.DeleteFeedback(context.Background(), "read", f.UserID, f.ItemID)
}
```

This approve is not that nice, better approach should be passing exclude item IDs too to GetRecommend api

Start by tracing the GetRecommend API entry point and the recommendation flow it invokes; the issue does not name implementation files or tests. Clarify the request shape and exclusion semantics, then verify that recommendations never include the supplied item IDs and that existing behavior remains covered by tests.

Written by the indexing model from the issue text.