Add FastAPI backend and React frontend setup with initial routes and components

backend/app/main.py

@@ -0,0 +1,21 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from .routers import example_router
+
+app = FastAPI()
+
+# Configure CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173"],  # Vite's default port
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include routers
+app.include_router(example_router.router)
+
+@app.get("/")
+async def root():
+    return {"message": "Welcome to FastAPI"}