Add backend and frontend skeleton

app/backend/main.py

@@ -0,0 +1,49 @@
+"""Application entrypoint and router wiring."""
+
+from fastapi import Depends, FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from api.v1.router import router as api_v1_router
+from core.config import Settings, get_settings
+from features.health.router import build_health_payload
+from features.health.schemas import HealthResponse
+
+
+def create_app() -> FastAPI:
+    """Create and configure the FastAPI application."""
+    app = FastAPI(
+        title="avaaz-backend",
+        version="0.1.0",
+        docs_url="/docs",
+        redoc_url="/redoc",
+    )
+
+    # CORS for local dev (frontend on 3000). Tighten/override in prod.
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=["http://localhost:3000", "http://127.0.0.1:3000"],
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    app.include_router(api_v1_router, prefix="/api/v1")
+
+    @app.get("/healthz", tags=["health"], response_model=HealthResponse)
+    def liveness(settings: Settings = Depends(get_settings)) -> HealthResponse:
+        """Liveness probe: process is up."""
+        return build_health_payload(settings)
+
+    @app.get("/readyz", tags=["health"], response_model=HealthResponse)
+    def readiness(settings: Settings = Depends(get_settings)) -> HealthResponse:
+        """
+        Readiness probe: instance can serve traffic.
+
+        Extend to check dependencies (DB, cache, queues) when they are added.
+        """
+        return build_health_payload(settings)
+
+    return app
+
+
+app = create_app()