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
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