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/tests/conftest.py

@@ -0,0 +1,22 @@
+"""Test fixtures: fresh temp-file SQLite DB per test session (spec §8.4)."""
+
+import os
+import tempfile
+
+import pytest
+
+# Must be set before any app module is imported (engine binds at import time)
+_tmpdir = tempfile.mkdtemp(prefix="calcount-test-")
+os.environ["CALCOUNT_DATABASE_URL"] = f"sqlite:///{_tmpdir}/test.db"
+
+from fastapi.testclient import TestClient  # noqa: E402
+
+from database import run_migrations  # noqa: E402
+from main import app  # noqa: E402
+
+
+@pytest.fixture(scope="session")
+def client():
+    run_migrations()
+    with TestClient(app) as c:
+        yield c