feat: core inventory API and secure operation routers

backend/main.py

@@ -1,12 +1,26 @@
 from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
 from . import models
 from .database import engine
+from .routers import items, operations
 
 # Create the database tables
 models.Base.metadata.create_all(bind=engine)
 
 app = FastAPI(title="Inventory PWA API", version="0.1.0")
 
+# Setup Cross-Origin for Client interaction (PWA)
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(items.router)
+app.include_router(operations.router)
+
 @app.get("/")
 def read_root():
     return {"message": "Inventory API is running"}