first commit 稳定版本，已知该版本存在问题，前端未对数据进行校验，没有集成导出excel

app.py

@@ -0,0 +1,52 @@
+import os
+import uuid
+from flask import Flask, request, jsonify, send_file
+from flask_cors import CORS
+from services.report_service import NutritionReportService
+
+app = Flask(__name__)
+
+CORS(app, resources={
+    r"/api/*": {
+        "origins": ["http://localhost:5173", "http://127.0.0.1:5173"]
+    }
+})
+
+report_service = NutritionReportService()
+
+
+@app.route("/api/food-record", methods=["POST"])
+def food_record():
+    try:
+        front_json = request.get_json()
+
+        if not front_json:
+            return jsonify({"message": "没有收到 JSON 数据"}), 400
+
+        print("收到前端数据：", front_json)
+
+        output_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "output", "reports")
+        os.makedirs(output_dir, exist_ok=True)
+
+        file_name = f"nutrition_report_{uuid.uuid4().hex}.pdf"
+        output_path = os.path.join(output_dir, file_name)
+
+        report_service.generate_report_from_json(front_json, output_path)
+
+        return send_file(
+            output_path,
+            as_attachment=True,
+            download_name="nutrition_report.pdf",
+            mimetype="application/pdf"
+        )
+
+    except Exception as e:
+        print("后端报错：", e)
+        return jsonify({
+            "message": "处理失败",
+            "error": str(e)
+        }), 500
+
+
+if __name__ == "__main__":
+    app.run(debug=True, port=5000)