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

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+"""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

backend/tests/test_health.py

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+"""Example API tests — scaffold for future suites (spec §8.4)."""
+
+
+def test_health(client):
+    resp = client.get("/api/health")
+    assert resp.status_code == 200
+    assert resp.json() == {"status": "ok"}
+
+
+def test_list_foods_empty(client):
+    resp = client.get("/api/foods")
+    assert resp.status_code == 200
+    assert resp.json() == []
+
+
+def test_get_log_empty(client):
+    resp = client.get("/api/log", params={"date": "2026-07-25"})
+    assert resp.status_code == 200
+    assert resp.json() == []
+
+
+def test_current_target_none(client):
+    resp = client.get("/api/targets/current")
+    assert resp.status_code == 404

backend/tests/test_nutrition.py

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+"""Example unit tests for the nutrition service (spec §8.4: test the math)."""
+
+from models import Food
+from services import nutrition
+
+
+def make_food(**overrides) -> Food:
+    """In-memory Food (no DB needed for pure math tests)."""
+    defaults = dict(
+        id=1,
+        name="Test Food",
+        brand=None,
+        barcode=None,
+        source="manual",
+        is_meal=False,
+        unit_type="weight",
+        calories_per_unit=250.0,
+        protein_per_unit=None,
+        carbs_per_unit=None,
+        fat_per_unit=None,
+        fiber_per_unit=None,
+        saturated_fat_per_unit=None,
+        sugars_per_unit=None,
+        sodium_per_unit=None,
+        serving_size_g=None,
+        serving_name=None,
+        off_data=None,
+        deleted_at=None,
+    )
+    defaults.update(overrides)
+    return Food(**defaults)
+
+
+def test_weight_type_scales_per_100g():
+    food = make_food(unit_type="weight", calories_per_unit=250.0)
+    assert nutrition.entry_calories(food, 200.0) == 500.0
+
+
+def test_count_type_scales_per_item():
+    food = make_food(unit_type="count", calories_per_unit=80.0)
+    assert nutrition.entry_calories(food, 3.0) == 240.0
+
+
+def test_missing_nutrition_counts_as_zero():
+    food = make_food(calories_per_unit=None)
+    assert nutrition.entry_calories(food, 100.0) == 0.0