fix(room): include @user mentions in AI prompt context

- Extend extract_mention_context to handle user mentions
- Both @[repo:xxx] and @[user:xxx] are now included in AI context

libs/room/src/service/history.rs

@@ -2,6 +2,7 @@ use db::database::AppDatabase;
 use models::repos::repo;
 use models::rooms::room_ai;
 use models::rooms::room_message::{Column as RmCol, Entity as RoomMessage};
+use models::users::user;
 use sea_orm::{ColumnTrait, EntityTrait, QueryFilter, QueryOrder, QuerySelect};
 use uuid::Uuid;
 
@@ -78,11 +79,16 @@ pub async fn extract_mention_context(
 ) -> Vec<agent::chat::Mention> {
     let mut mentions: Vec<agent::chat::Mention> = Vec::new();
     let mut seen_repos: Vec<String> = Vec::new();
+    let mut seen_users: Vec<String> = Vec::new();
 
     for cap in mention_bracket_re().captures_iter(content) {
         if let (Some(type_m), Some(id_m)) = (cap.get(1), cap.get(2)) {
-            if type_m.as_str() == "repo" {
+            let type_str = type_m.as_str();
-                let repo_name = id_m.as_str().trim().to_string();
+            let id = id_m.as_str().trim();
+
+            match type_str {
+                "repo" => {
+                    let repo_name = id.to_string();
                     if repo_name.is_empty() || seen_repos.contains(&repo_name) {
                         continue;
                     }
@@ -97,6 +103,20 @@ pub async fn extract_mention_context(
                         mentions.push(agent::chat::Mention::Repo(repo_model));
                     }
                 }
+                "user" => {
+                    if seen_users.contains(&id.to_string()) {
+                        continue;
+                    }
+                    seen_users.push(id.to_string());
+
+                    if let Ok(uuid) = Uuid::parse_str(id) {
+                        if let Ok(Some(user_model)) = user::Entity::find_by_id(uuid).one(db).await {
+                            mentions.push(agent::chat::Mention::User(user_model));
+                        }
+                    }
+                }
+                _ => {}
+            }
         }
     }