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/domain/entities/device_code.rs

@@ -28,7 +28,7 @@ impl DeviceCodeStatus {
         }
     }
 
-    pub fn from_str(s: &str) -> Option<Self> {
+    pub fn parse(s: &str) -> Option<Self> {
         match s {
             "pending" => Some(Self::Pending),
             "authorized" => Some(Self::Authorized),
@@ -76,6 +76,7 @@ impl DeviceCode {
     /// * `verification_uri` — URL the user must visit
     /// * `expires_in_secs` — TTL for the device code
     /// * `poll_interval_secs` — minimum polling interval
+    #[allow(clippy::too_many_arguments)]
     pub fn new(
         device_code: String,
         user_code: String,