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/interfaces/api/handlers/chunked_upload_handler.rs

@@ -17,13 +17,13 @@ use bytes::Bytes;
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
+use crate::application::ports::chunked_upload_ports::ChunkedUploadPort;
 use crate::application::ports::chunked_upload_ports::DEFAULT_CHUNK_SIZE;
+use crate::application::ports::file_ports::FileUploadUseCase;
+use crate::application::ports::storage_ports::StorageUsagePort;
 use crate::common::di::AppState;
 use crate::domain::errors::ErrorKind;
 use crate::interfaces::middleware::auth::AuthUser;
-use crate::application::ports::chunked_upload_ports::ChunkedUploadPort;
-use crate::application::ports::file_ports::FileUploadUseCase;
-use crate::application::ports::storage_ports::StorageUsagePort;
 
 /// Request body for creating an upload session
 #[derive(Debug, Deserialize)]