- Added `cryptography` dependency to `pyproject.toml`.
- Introduced `CustomRemarks` and `HwidSettings` models in `subscriptions_settings.py`.
- Updated `UserResponseDto` to include `UserTrafficDto` for better traffic tracking.
- Refactored host models to use dictionaries for `mux_params` and `sockopt_params`.
- Enhanced `CreateHostRequestDto` and `UpdateHostRequestDto` with new fields.
- Implemented `create_happ_crypto_link` function for generating HAPP links.
- Updated various response DTOs to improve structure and backward compatibility.
- Removed deprecated tests related to node user usage history.
- Implemented models for nodes usage history including NodeInfoDto, GetUserAccessibleNodesResponse, and usage statistics.
- Created subscription-related models such as UserSubscription, SubscriptionInfoData, and various response DTOs for subscription information.
- Developed models for subscription settings, templates, and system statistics, enhancing the API's capability to manage and retrieve subscription configurations.
- Introduced user management models including CreateUserRequestDto, UpdateUserRequestDto, and various response DTOs for user actions.
- Added bulk actions for user updates and statistics tracking, improving the efficiency of user management operations.
- Established a base controller for handling API requests and responses, along with decorators for HTTP methods to streamline API interactions.
- Included utility functions for serialization using orjson for better performance with Pydantic models.
