Initial implementation of Options Sidekick

Full-stack iOS options trading assistant:
- Python FastAPI backend with SQLite, APScheduler (15-min position monitor),
  APNs push notifications, and yfinance market data integration
- Signal engine: IV Rank (rolling HV proxy), SMA-50/200, swing-based
  support/resistance, earnings detection, signal strength scoring and
  noise-resistant SHA hash for change detection
- Recommendation engine: covered call and cash-secured put strike/expiry
  selection across 0DTE, 1DTE, weekly, and monthly horizons
- REST API: /devices, /portfolio, /recommendations, /positions, /signals, /alerts
- iOS SwiftUI app (iOS 17+): dashboard, recommendations, trades, portfolio,
  and alerts tabs with push notification deep-linking
- Unit + integration tests for signal engine and API layer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/main.py

@@ -0,0 +1,54 @@
+from contextlib import asynccontextmanager
+from datetime import datetime
+from typing import AsyncGenerator
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.database import init_db
+from app.scheduler import start_scheduler, stop_scheduler, scheduler
+from app.routers import devices, portfolio, recommendations, positions, signals, alerts
+from app.models.schemas import HealthResponse
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI) -> AsyncGenerator:
+    # Startup
+    init_db()
+    start_scheduler()
+    yield
+    # Shutdown
+    stop_scheduler()
+
+
+app = FastAPI(
+    title="Options Sidekick",
+    description="Covered call and cash-secured put recommendation engine",
+    version="1.0.0",
+    lifespan=lifespan,
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Routers
+app.include_router(devices.router, prefix="/api/v1")
+app.include_router(portfolio.router, prefix="/api/v1")
+app.include_router(recommendations.router, prefix="/api/v1")
+app.include_router(positions.router, prefix="/api/v1")
+app.include_router(signals.router, prefix="/api/v1")
+app.include_router(alerts.router, prefix="/api/v1")
+
+
+@app.get("/api/v1/health", response_model=HealthResponse, tags=["health"])
+def health():
+    from app.services.position_monitor import last_run
+    return HealthResponse(
+        status="ok",
+        scheduler_running=scheduler.running,
+        last_run=last_run,
+    )