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/upload_avatar.rs

@@ -0,0 +1,56 @@
+use actix_web::{HttpResponse, web};
+
+use crate::api::response::{ApiErrorResponse, ApiResponse};
+use crate::error::AppError;
+use crate::service::AppService;
+use crate::service::user::account::{UploadUserAvatarParams, UserAvatarResponse};
+use crate::session::Session;
+
+/// Upload user avatar
+///
+/// Uploads a new avatar image for the authenticated user.
+/// Requires authentication.
+///
+/// Parameters:
+/// - data: Raw avatar image bytes (PNG, JPEG, or WebP, max 5MB)
+/// - content_type: MIME type of the image (e.g., "image/png")
+/// - file_name: Original file name (used to infer file extension)
+///
+/// Effects:
+/// - Avatar image is stored in S3-compatible object storage
+/// - Previous avatar is deleted from storage
+/// - User's avatar URL is updated
+///
+/// Returns the new avatar URL and storage key.
+#[utoipa::path(
+    post,
+    path = "/api/v1/user/account/avatar",
+    tag = "User",
+    operation_id = "userUploadAvatar",
+    request_body(
+        content = UploadUserAvatarParams,
+        description = "Avatar upload parameters",
+        content_type = "application/json"
+    ),
+    responses(
+        (status = 200, description = "Avatar uploaded successfully. Returns the new avatar URL and storage key.", body = ApiResponse<UserAvatarResponse>),
+        (status = 400, description = "Invalid parameters: unsupported file type or image too large", body = ApiErrorResponse),
+        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
+        (status = 404, description = "User not found", body = ApiErrorResponse),
+        (status = 500, description = "Internal server error or S3 storage failure", body = ApiErrorResponse),
+    ),
+    security(
+        ("session_cookie" = [])
+    )
+)]
+pub async fn upload_avatar(
+    service: web::Data<AppService>,
+    session: Session,
+    params: web::Json<UploadUserAvatarParams>,
+) -> Result<HttpResponse, AppError> {
+    let response = service
+        .user
+        .user_upload_avatar(&session, params.into_inner())
+        .await?;
+    Ok(HttpResponse::Ok().json(ApiResponse::new(response)))
+}