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

api/routes.rs

@@ -0,0 +1,6 @@
+use actix_web::web;
+use actix_web::web::scope;
+
+pub fn init_routes(cfg: &mut web::ServiceConfig) {
+    cfg.service(scope("/api/v1"));
+}