feat(v1): add basic backend and frontend

backend/.env.sample

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+DJANGO_DEBUG=1
+DJANGO_SECRET_KEY=dev-spatial-image-enhancer-change-before-production
+DJANGO_ALLOWED_HOSTS=localhost,127.0.0.1,api
+DJANGO_CSRF_TRUSTED_ORIGINS=http://localhost:5173,http://127.0.0.1:5173,http://localhost:8000,http://127.0.0.1:8000
+CORS_ALLOWED_ORIGINS=http://localhost:5173,http://127.0.0.1:5173
+DJANGO_SECURE_SSL_REDIRECT=0
+DJANGO_SESSION_COOKIE_SECURE=0
+DJANGO_CSRF_COOKIE_SECURE=0
+DJANGO_SECURE_HSTS_SECONDS=0
+DJANGO_SECURE_HSTS_INCLUDE_SUBDOMAINS=0
+DJANGO_SECURE_HSTS_PRELOAD=0
+DJANGO_LOG_LEVEL=INFO
+POSTGRES_DB=enhancer
+POSTGRES_USER=enhancer
+POSTGRES_PASSWORD=enhancer
+POSTGRES_HOST=
+POSTGRES_PORT=5432
+POSTGRES_CONN_MAX_AGE=60
+CELERY_BROKER_URL=redis://localhost:6379/0
+CELERY_RESULT_BACKEND=redis://localhost:6379/0
+CELERY_TASK_TIME_LIMIT=600
+IMAGE_SESSION_TTL_HOURS=6
+MAX_UPLOAD_MB=20