fix: resolve all clippy warnings and convert integration_tests to custom cfg

- Add type aliases (FileRow, FolderRow, FolderRowPaginated, FolderRowOptUser) to reduce type complexity
- Simplify redundant closures in app_password_handler and webdav_handler
- Remove needless borrow in auth_handler
- Collapse nested if/let chains in login_lockout, webdav_lock, auth, rate_limit
- Box LockEntry in acquire() Err variant to fix large enum variant warning
- Rename DeviceCodeStatus::from_str to parse to avoid should_implement_trait lint
- Add #[allow(clippy::too_many_arguments)] and #[allow(clippy::result_unit_err)] where appropriate
- Convert integration_tests from cargo feature to custom cfg attribute
- Add check-cfg lint config in Cargo.toml for integration_tests cfg

src/application/ports/file_ports.rs

@@ -6,10 +6,10 @@ use std::sync::Arc;
 
 use crate::application::dtos::file_dto::FileDto;
 use crate::application::ports::storage_ports::CopyFolderTreeResult;
-use crate::common::errors::DomainError;
 use crate::application::services::file_management_service::FileManagementService;
 use crate::application::services::file_retrieval_service::FileRetrievalService;
 use crate::application::services::file_upload_service::FileUploadService;
+use crate::common::errors::DomainError;
 
 // ─────────────────────────────────────────────────────
 // Upload port

src/application/ports/share_ports.rs

@@ -1,4 +1,3 @@
-
 use crate::{
     application::dtos::{
         pagination::PaginatedResponseDto,

src/application/ports/trash_ports.rs

@@ -1,4 +1,3 @@
-
 use crate::application::dtos::trash_dto::TrashedItemDto;
 use crate::common::errors::Result;