feat: Initialize frontend and backend structure with essential configurations

- Added TypeScript build info for frontend.
- Created Vite configuration for React application.
- Implemented pre-commit hook to run checks before commits.
- Set up PostgreSQL Dockerfile with PostGIS support and initialization scripts.
- Added database creation script for PostgreSQL with necessary extensions.
- Established Python project configuration with dependencies and development tools.
- Developed pre-commit script to enforce code quality checks for backend and frontend.
- Created PowerShell script to set up Git hooks path.

backend/app/db/__init__.py

@@ -0,0 +1,6 @@
+"""Database package exposing SQLAlchemy base metadata and session utilities."""
+
+from backend.app.db.models import Base
+from backend.app.db.session import SessionLocal, engine, get_db_session
+
+__all__ = ["Base", "SessionLocal", "engine", "get_db_session"]