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/core/security.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+from datetime import datetime, timedelta, timezone
+from typing import Any, Dict
+
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+
+from backend.app.core.config import get_settings
+
+pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def create_access_token(subject: str, expires_delta: timedelta | None = None) -> str:
+    settings = get_settings()
+    expire = datetime.now(timezone.utc) + (
+        expires_delta or timedelta(minutes=settings.access_token_expire_minutes)
+    )
+    to_encode: Dict[str, Any] = {"sub": subject, "exp": expire}
+    return jwt.encode(to_encode, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
+
+
+def decode_access_token(token: str) -> Dict[str, Any]:
+    settings = get_settings()
+    try:
+        return jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
+    except JWTError as exc:  # pragma: no cover - specific error mapping handled by caller
+        raise ValueError("Invalid token") from exc