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/tests/test_repositories.py

@@ -0,0 +1,106 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, List
+
+import pytest
+
+from backend.app.models import StationCreate, TrackCreate, TrainCreate
+from backend.app.repositories import StationRepository, TrackRepository, TrainRepository
+
+
+@dataclass
+class DummySession:
+    added: List[Any] = field(default_factory=list)
+
+    def add(self, instance: Any) -> None:
+        self.added.append(instance)
+
+    def add_all(self, instances: list[Any]) -> None:
+        self.added.extend(instances)
+
+    def scalars(self, _statement: Any) -> list[Any]:  # pragma: no cover - not used here
+        return []
+
+    def flush(self, _objects: list[Any] | None = None) -> None:  # pragma: no cover - optional
+        return None
+
+
+def test_station_repository_create_generates_geometry() -> None:
+    session = DummySession()
+    repo = StationRepository(session)  # type: ignore[arg-type]
+
+    station = repo.create(
+        StationCreate(
+            name="Central",
+            latitude=52.52,
+            longitude=13.405,
+            osm_id="123",
+            code="BER",
+            elevation_m=34.5,
+        )
+    )
+
+    assert station.name == "Central"
+    assert session.added and session.added[0] is station
+    assert getattr(station.location, "srid", None) == 4326
+    assert "POINT" in str(station.location)
+
+
+def test_track_repository_requires_geometry() -> None:
+    session = DummySession()
+    repo = TrackRepository(session)  # type: ignore[arg-type]
+
+    with pytest.raises(ValueError):
+        repo.create(
+            TrackCreate(
+                start_station_id="00000000-0000-0000-0000-000000000001",
+                end_station_id="00000000-0000-0000-0000-000000000002",
+                coordinates=[(52.0, 13.0)],
+            )
+        )
+
+
+def test_track_repository_create_builds_linestring() -> None:
+    session = DummySession()
+    repo = TrackRepository(session)  # type: ignore[arg-type]
+
+    track = repo.create(
+        TrackCreate(
+            name="Main Line",
+            start_station_id="00000000-0000-0000-0000-000000000001",
+            end_station_id="00000000-0000-0000-0000-000000000002",
+            coordinates=[(52.0, 13.0), (53.0, 14.0)],
+            length_meters=1000.5,
+            max_speed_kph=160,
+            is_bidirectional=False,
+            status="operational",
+        )
+    )
+
+    assert session.added and session.added[0] is track
+    assert track.status == "operational"
+    geom_repr = str(track.track_geometry)
+    assert "LINESTRING" in geom_repr
+    assert "13.0 52.0" in geom_repr
+
+
+def test_train_repository_create_supports_optional_ids() -> None:
+    session = DummySession()
+    repo = TrainRepository(session)  # type: ignore[arg-type]
+
+    train = repo.create(
+        TrainCreate(
+            designation="ICE 123",
+            capacity=400,
+            max_speed_kph=300,
+            operator_id=None,
+            home_station_id="00000000-0000-0000-0000-000000000001",
+            consist="locomotive+cars",
+        )
+    )
+
+    assert session.added and session.added[0] is train
+    assert train.designation == "ICE 123"
+    assert str(train.home_station_id).endswith("1")
+    assert train.operator_id is None