- Introduced `/api/v1/admin/sessions` endpoint to fetch paginated session data for admin monitoring.
- Added `AdminSessionResponse` schema to include user details in session responses.
- Implemented session data retrieval with filtering and pagination in `session_crud`.
- Created comprehensive test suite for session management, covering success, filtering, pagination, and unauthorized access scenarios.
- Introduced `user_sessions` table with support for per-device authentication sessions.
- Added `UserSession` model, including fields for device metadata, IP, and session state.
- Created schemas (`SessionBase`, `SessionCreate`, `SessionResponse`) to manage session data and responses.
- Implemented utilities for extracting and parsing device information from HTTP requests.
- Added Alembic migration to define `user_sessions` table with indexes for performance and cleanup.
