Add simple FastAPI backend

backend/docker/Dockerfile

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+FROM python:3.13.7-slim-bookworm
+
+WORKDIR /app
+
+# Copy requirements and install Python dependencies
+COPY ./requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the app code and tests
+COPY ../src ./src
+
+CMD ["python", "src/main.py"]

backend/requirements.txt

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+fastapi
+uvicorn[standard]

backend/src/main.py

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+from fastapi import FastAPI
+
+app = FastAPI(title="HanchuESS Solar Backend API")
+
+@app.get("/", tags=["Root"])
+def root():
+    return {"message": "Welcome to the HanchuESS Solar Backend API!"}
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8050)

docker-compose.yml

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+services:
+  hanchuess-solar-backend:
+    build:
+      context: backend
+      dockerfile: docker/Dockerfile
+    container_name: hanchuess-solar-backend
+    ports:
+      - "8050:8050"