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

backend/app/dependencies.py

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+from fastapi import Header, HTTPException
+
+async def get_token_header(x_token: str = Header()):
+    if x_token != "fake-super-secret-token":
+        raise HTTPException(status_code=400, detail="X-Token header invalid")

backend/app/main.py

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+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"}

backend/app/routers/__init__.py

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+
+# backend/app/routers/__init__.py

backend/app/routers/example_router.py

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+from fastapi import APIRouter
+
+router = APIRouter(
+    prefix="/api",
+    tags=["example"],
+    responses={404: {"description": "Not found"}},
+)
+
+@router.get("/items")
+async def read_items():
+    return [{"name": "Item 1"}, {"name": "Item 2"}]

backend/requirements.txt

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+fastapi==0.100.0
+uvicorn==0.22.0
+pydantic==2.0.2