feat(session): integrate actix-web framework with enhanced session management

- Added actix-web and actix-multipart dependencies to Cargo.toml
- Integrated actix-web ResponseError trait for AppError handling
- Migrated session module to use actix-web request lifecycle management
- Enhanced Session struct with request-local state handling capabilities
- Implemented proper HTTP status code mapping for various error types
- Added comprehensive session middleware integration points
- Updated session state persistence and modification tracking logic
- Integrated proper JSON response formatting for error messages
- Added support for session renewal, purge, and unchanged state management

session/mod.rs

@@ -1,9 +1,11 @@
 pub mod config;
+pub mod middleware;
 #[allow(clippy::module_inception)]
 pub mod session;
 pub mod storage;
 
 pub use self::{
+    middleware::{CookieContentSecurity, SessionMiddleware, TtlExtensionPolicy},
     session::{Session, SessionState, SessionStatus, SessionUser},
     storage::{RedisSessionStore, SessionKey, SessionStore, generate_session_key},
 };