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/main.py

@@ -0,0 +1,37 @@
+"""CalCount FastAPI app entry point."""
+
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from database import run_migrations
+from routers import foods, log, off, targets
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Migrations from day one, applied at startup (spec §8.1 rule 9)
+    run_migrations()
+    yield
+
+
+app = FastAPI(title="CalCount", lifespan=lifespan)
+
+# Vite dev server origin; tighten for production deployment
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(foods.router)
+app.include_router(log.router)
+app.include_router(targets.router)
+app.include_router(off.router)
+
+
+@app.get("/api/health")
+def health():
+    return {"status": "ok"}