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/base.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+import sqlalchemy as sa
+from typing import Generic, Iterable, Optional, Sequence, Type, TypeVar
+
+from sqlalchemy.orm import Session
+
+from backend.app.db.models import Base
+
+ModelT = TypeVar("ModelT", bound=Base)
+
+
+class BaseRepository(Generic[ModelT]):
+    """Provide common CRUD helpers for SQLAlchemy models."""
+
+    model: Type[ModelT]
+
+    def __init__(self, session: Session) -> None:
+        self.session = session
+
+    def get(self, identifier: object) -> Optional[ModelT]:
+        return self.session.get(self.model, identifier)
+
+    def list(self) -> Sequence[ModelT]:
+        statement = sa.select(self.model)
+        return list(self.session.scalars(statement))
+
+    def add(self, instance: ModelT) -> ModelT:
+        self.session.add(instance)
+        return instance
+
+    def add_all(self, instances: Iterable[ModelT]) -> None:
+        self.session.add_all(instances)
+
+    def delete(self, instance: ModelT) -> None:
+        self.session.delete(instance)
+
+    def flush(self) -> None:
+        self.session.flush()