feat: refactor notebook into a structured project

Author: tiviluson

backend/geometry_tutor/__init__.py

@@ -0,0 +1,12 @@
+"""
+AI Geometry Tutor for Vietnamese High School Students
+
+This package implements an AI-powered Geometry Tutor system using LangGraph 
+and LLM-native reasoning designed for Vietnamese high school students.
+"""
+
+from .tutor import GeometryTutor
+from .core import GraphState, create_initial_state
+
+__version__ = "0.1.0"
+__all__ = ["GeometryTutor", "GraphState", "create_initial_state"]