Add project setup: pyproject.toml, .gitignore, .env.example

Set up Python project with hatch build system and all core
dependencies: FastAPI, SQLAlchemy, Playwright, httpx, Streamlit,
Plotly, rapidfuzz, APScheduler.

.env.example

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+DATABASE_URL=postgresql+asyncpg://smartcart:smartcart@localhost:5432/smartcart
+DATABASE_URL_SYNC=postgresql://smartcart:smartcart@localhost:5432/smartcart
+
+# SuperValu login (required for scraping)
+SUPERVALU_EMAIL=
+SUPERVALU_PASSWORD=
+
+# Scheduler
+SCRAPE_HOUR=22
+SCRAPE_MINUTE=0
+
+# API
+API_HOST=0.0.0.0
+API_PORT=8000
+
+# Dashboard
+DASHBOARD_PORT=8501
+API_BASE_URL=http://localhost:8000

.gitignore

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+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+dist/
+build/
+.eggs/
+*.egg
+.env
+.venv/
+venv/
+*.db
+*.sqlite3
+.ruff_cache/
+.pytest_cache/
+.coverage
+htmlcov/
+.mypy_cache/

pyproject.toml

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+[project]
+name = "smartcart"
+version = "0.1.0"
+description = "Price comparison system for Irish supermarkets"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi>=0.115.0",
+    "uvicorn[standard]>=0.32.0",
+    "sqlalchemy[asyncio]>=2.0.36",
+    "alembic>=1.14.0",
+    "asyncpg>=0.30.0",
+    "pydantic>=2.10.0",
+    "pydantic-settings>=2.6.0",
+    "playwright>=1.49.0",
+    "httpx>=0.28.0",
+    "beautifulsoup4>=4.12.0",
+    "rapidfuzz>=3.10.0",
+    "apscheduler>=3.10.0",
+    "streamlit>=1.40.0",
+    "plotly>=5.24.0",
+    "python-dotenv>=1.0.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.3.0",
+    "pytest-asyncio>=0.24.0",
+    "pytest-cov>=6.0.0",
+    "httpx>=0.28.0",
+    "ruff>=0.8.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+
+[tool.ruff]
+target-version = "py312"
+line-length = 100