chore: wire documents router into main.py for testing

backend/app/main.py

@@ -2,6 +2,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.config import settings
+from app.routers import documents
 
 app = FastAPI(title="DocHub API")
 
@@ -13,6 +14,8 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+app.include_router(documents.router)
+
 
 @app.get("/health")
 def health():