Agrega backend FastAPI al proyecto

recolector_backend/app/main.py

@@ -0,0 +1,42 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.config import settings
+from app.database import Base, SessionLocal, engine
+from app.routers import admin, auth, citizen, operator, public
+from app.seed import seed_database
+
+Base.metadata.create_all(bind=engine)
+
+with SessionLocal() as db:
+    seed_database(db)
+
+app = FastAPI(
+    title=settings.app_name,
+    version="1.0.0",
+    description="Backend MVP para app de notificación privada de recolección de residuos por roles: ciudadano, operador y administrador.",
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(public.router)
+app.include_router(auth.router)
+app.include_router(citizen.router)
+app.include_router(operator.router)
+app.include_router(admin.router)
+
+
+@app.get("/")
+def root():
+    return {
+        "ok": True,
+        "name": settings.app_name,
+        "docs": "/docs",
+        "roles": ["ciudadano", "operador", "admin"],
+    }