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_oauth_accounts.rs

@@ -0,0 +1,35 @@
+use actix_web::{HttpResponse, web};
+
+use crate::api::response::{ApiErrorResponse, ApiResponse};
+use crate::error::AppError;
+use crate::service::AppService;
+use crate::service::user::security::UserOAuthInfo;
+use crate::session::Session;
+
+/// List OAuth accounts
+///
+/// Returns all linked OAuth/third-party login accounts for the authenticated user.
+/// Accounts are sorted by link date (most recent first).
+/// Includes provider information, usernames, and token expiry status.
+/// Requires authentication.
+#[utoipa::path(
+    get,
+    path = "/api/v1/user/security/oauth",
+    tag = "User",
+    operation_id = "userListOAuthAccounts",
+    responses(
+        (status = 200, description = "OAuth accounts listed successfully. Returns array of linked OAuth accounts with provider details.", body = ApiResponse<Vec<UserOAuthInfo>>),
+        (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_oauth_accounts(
+    service: web::Data<AppService>,
+    session: Session,
+) -> Result<HttpResponse, AppError> {
+    let accounts = service.user.user_oauth_accounts(&session).await?;
+    Ok(HttpResponse::Ok().json(ApiResponse::new(accounts)))
+}