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/infrastructure/services/path_service.rs

@@ -312,7 +312,15 @@ mod tests {
     #[test]
     fn test_validate_path_rejects_dangerous_chars() {
         let service = PathService::new(PathBuf::from("/storage"));
-        for dangerous in &["file:name", "file*name", "file?name", "file<name", "file>name", "file|name", "file\"name"] {
+        for dangerous in &[
+            "file:name",
+            "file*name",
+            "file?name",
+            "file<name",
+            "file>name",
+            "file|name",
+            "file\"name",
+        ] {
             let path = StoragePath::new(vec![dangerous.to_string()]);
             assert!(
                 service.validate_path(&path).is_err(),