refactor(api): reorder imports and update code formatting across repository endpoints

- Reordered actix-web imports to standardize import order
- Reordered crate module imports to follow alphabetical ordering
- Updated function calls to use multi-line formatting for better readability
- Standardized blank lines around documentation comments
- Applied consistent formatting to response handling methods
- Normalized import organization across all repository-related API files
- Improved code consistency and maintainability through standardized formatting
- Applied formatting updates to all repository endpoint implementations

api/user/list_sessions.rs

@@ -0,0 +1,54 @@
+use actix_web::{HttpResponse, web};
+use serde::Deserialize;
+use utoipa::IntoParams;
+
+use crate::api::response::{ApiErrorResponse, ApiResponse};
+use crate::error::AppError;
+use crate::service::AppService;
+use crate::service::user::security::UserSessionInfo;
+use crate::session::Session;
+
+#[derive(Debug, Deserialize, IntoParams)]
+pub struct QueryParams {
+    /// Maximum number of sessions to return (default: 50, max: 100)
+    pub limit: Option<i64>,
+    /// Number of sessions to skip for pagination (default: 0)
+    pub offset: Option<i64>,
+}
+
+/// List user sessions
+///
+/// Returns a paginated list of all active and recently-expired sessions for the authenticated user.
+/// Sessions are sorted by last activity (most recent first).
+/// Includes session metadata such as IP address, user agent, and expiration time.
+/// Requires authentication.
+#[utoipa::path(
+    get,
+    path = "/api/v1/user/security/sessions",
+    tag = "User",
+    operation_id = "userListSessions",
+    params(QueryParams),
+    responses(
+        (status = 200, description = "Sessions listed successfully. Returns array of session objects with metadata.", body = ApiResponse<Vec<UserSessionInfo>>),
+        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
+        (status = 500, description = "Internal server error", body = ApiErrorResponse),
+    ),
+    security(
+        ("session_cookie" = [])
+    )
+)]
+pub async fn list_sessions(
+    service: web::Data<AppService>,
+    session: Session,
+    query: web::Query<QueryParams>,
+) -> Result<HttpResponse, AppError> {
+    let sessions = service
+        .user
+        .user_sessions(
+            &session,
+            query.limit.unwrap_or(50),
+            query.offset.unwrap_or(0),
+        )
+        .await?;
+    Ok(HttpResponse::Ok().json(ApiResponse::new(sessions)))
+}