Initial commit: full fitness-rewards app

Backend: FastAPI + PostgreSQL + SQLAlchemy async
- Auth (JWT), onboarding (PAR-Q+, TTM, BREQ-2), activities, food log
- Points engine with daily gate + weekly targets
- Strava + Polar OAuth integration
- Open Food Facts barcode lookup
- Resource recommendation engine
- 10 seeded Darebee/StrongLifts/YouTube programs

Frontend: React + Vite, mobile-first dark theme
- Login/Register, 8-step onboarding flow
- Dashboard with daily gate status
- Activity logger, food logger (manual + barcode scan + search)
- Reward shop with redemption
- Weekly summary view
- Settings (point rules, targets, integrations)

Deployment: Docker Compose for Coolify (Traefik)

backend/app/utils/dates.py

@@ -0,0 +1,18 @@
+from datetime import date, timedelta
+
+
+def get_week_boundaries(d: date) -> tuple[date, date]:
+    """Return Monday and Sunday of the week containing date d."""
+    monday = d - timedelta(days=d.weekday())
+    sunday = monday + timedelta(days=6)
+    return monday, sunday
+
+
+def get_month_boundaries(year: int, month: int) -> tuple[date, date]:
+    """Return first and last day of a month."""
+    first = date(year, month, 1)
+    if month == 12:
+        last = date(year + 1, 1, 1) - timedelta(days=1)
+    else:
+        last = date(year, month + 1, 1) - timedelta(days=1)
+    return first, last