Implement real, working microservices architecture

backend/services/device/Dockerfile

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+# Device Service Dockerfile
+FROM backend/base:latest
+
+# Copy service-specific files
+COPY backend/routes/devices.py /app/backend/routes/devices.py
+COPY backend/services/device/main.py /app/backend/services/device/main.py
+
+# Set service name for entrypoint
+ENV SERVICE_NAME=device
+
+EXPOSE 8301

backend/services/device/main.py

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+from fastapi import FastAPI
+from backend.routes.devices import router as device_router
+
+if __name__ == "__main__":
+    app = FastAPI(title="Device Service")
+    app.include_router(device_router, prefix="/devices")
+
+    import os, uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=int(os.getenv("PORT", 8301)))