feat: initial project setup

backend/app/main.py

@@ -0,0 +1,29 @@
+"""House ELO Ranking API."""
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.routers import comparisons, listings, rankings
+
+app = FastAPI(
+    title="House ELO Ranking",
+    description="Pairwise comparison and ELO ranking of Funda listings",
+    version="1.0.0",
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(comparisons.router, prefix="/api", tags=["comparisons"])
+app.include_router(listings.router, prefix="/api", tags=["listings"])
+app.include_router(rankings.router, prefix="/api", tags=["rankings"])
+
+
+@app.get("/api/health")
+def health():
+    return {"status": "ok"}