Initial project scaffold: FastAPI backend + Svelte 5 frontend

Backend (uv): FastAPI app with routers (foods, log, targets, OFF proxy),
SQLAlchemy models, Pydantic schemas, migration runner + 0001 initial schema,
example pytest suite (7 tests).
Frontend (npm): Vite 7 + Svelte 5 runes, lib/ (api, stores, scanner, format)
per spec §7, placeholder components, example vitest suite (4 tests).
SPEC.md §1: registered uvicorn and Vitest (rule §8.3.3).

backend/pyproject.toml

@@ -0,0 +1,21 @@
+[project]
+name = "calcount-backend"
+version = "0.1.0"
+description = "CalCount backend — FastAPI + SQLite + OpenFoodFacts proxy"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi>=0.115,<1.0",
+    "httpx>=0.27",
+    "pydantic>=2.7,<3",
+    "sqlalchemy>=2.0,<2.1",
+    "uvicorn>=0.30",
+]
+
+[dependency-groups]
+dev = [
+    "pytest>=8",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+pythonpath = ["."]