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/add_ssh_key.rs

@@ -0,0 +1,58 @@
+use actix_web::{HttpResponse, web};
+
+use crate::api::response::{ApiErrorResponse, ApiResponse};
+use crate::error::AppError;
+use crate::models::users::UserSshKey;
+use crate::service::AppService;
+use crate::service::user::keys::AddSshKeyParams;
+use crate::session::Session;
+
+/// Add an SSH key
+///
+/// Registers a new SSH public key for the authenticated user.
+/// Requires authentication.
+///
+/// Parameters:
+/// - title: Human-readable label for the key (e.g., "Work Laptop")
+/// - public_key: SSH public key string (supports RSA, Ed25519, ECDSA, DSA)
+/// - key_type: Key algorithm type ("rsa", "ed25519", "ecdsa", "dsa")
+/// - expires_at: Optional expiration date for the key
+///
+/// Effects:
+/// - Key fingerprint is computed and stored
+/// - Key is immediately usable for Git operations
+/// - Duplicate keys are rejected
+///
+/// Returns the created SSH key with fingerprint and metadata.
+#[utoipa::path(
+    post,
+    path = "/api/v1/user/keys/ssh",
+    tag = "User",
+    operation_id = "userAddSshKey",
+    request_body(
+        content = AddSshKeyParams,
+        description = "SSH key creation parameters",
+        content_type = "application/json"
+    ),
+    responses(
+        (status = 201, description = "SSH key added successfully. Returns the created key with fingerprint and metadata.", body = ApiResponse<UserSshKey>),
+        (status = 400, description = "Invalid parameters: invalid key format, unsupported key type, or type mismatch", body = ApiErrorResponse),
+        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
+        (status = 409, description = "SSH key with this fingerprint already exists", body = ApiErrorResponse),
+        (status = 500, description = "Internal server error", body = ApiErrorResponse),
+    ),
+    security(
+        ("session_cookie" = [])
+    )
+)]
+pub async fn add_ssh_key(
+    service: web::Data<AppService>,
+    session: Session,
+    params: web::Json<AddSshKeyParams>,
+) -> Result<HttpResponse, AppError> {
+    let key = service
+        .user
+        .user_add_ssh_key(&session, params.into_inner())
+        .await?;
+    Ok(HttpResponse::Created().json(ApiResponse::new(key)))
+}