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/repositories/trains.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import sqlalchemy as sa
+from uuid import UUID
+from sqlalchemy.orm import Session
+
+from backend.app.db.models import Train
+from backend.app.repositories.base import BaseRepository
+from backend.app.models import TrainCreate
+
+
+class TrainRepository(BaseRepository[Train]):
+    model = Train
+
+    def __init__(self, session: Session) -> None:
+        super().__init__(session)
+
+    def list_all(self) -> list[Train]:
+        statement = sa.select(self.model)
+        return list(self.session.scalars(statement))
+
+    @staticmethod
+    def _optional_uuid(value: UUID | str | None) -> UUID | None:
+        if value is None:
+            return None
+        if isinstance(value, UUID):
+            return value
+        return UUID(str(value))
+
+    def create(self, data: TrainCreate) -> Train:
+        train = Train(
+            designation=data.designation,
+            operator_id=self._optional_uuid(data.operator_id),
+            home_station_id=self._optional_uuid(data.home_station_id),
+            capacity=data.capacity,
+            max_speed_kph=data.max_speed_kph,
+            consist=data.consist,
+        )
+        self.session.add(train)
+        return train