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/routes.rs

@@ -1,3 +1,4 @@
+use crate::application::services::batch_operations::BatchOperationService;
 use crate::common::di::AppState;
 use axum::{
     Router,
@@ -8,7 +9,6 @@ use axum::{
 use serde_json::json;
 use std::sync::Arc;
 use tower_http::{compression::CompressionLayer, trace::TraceLayer};
-use crate::application::services::batch_operations::BatchOperationService;
 
 /// Returns the application version from Cargo.toml (compile-time constant)
 async fn get_version() -> AxumJson<serde_json::Value> {
@@ -18,7 +18,6 @@ async fn get_version() -> AxumJson<serde_json::Value> {
     }))
 }
 
-
 use crate::interfaces::api::handlers::admin_handler;
 use crate::interfaces::api::handlers::batch_handler::{self, BatchHandlerState};
 use crate::interfaces::api::handlers::chunked_upload_handler::ChunkedUploadHandler;