feat(api): 添加营养建议端点 /api/nutrition/recommendations

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/test_web.py

@@ -317,3 +317,14 @@ def test_bmi_analysis_endpoint(client):
     assert "bmi_status" in data
     assert "target_weight" in data
     assert "estimated_days" in data
+
+
+def test_nutrition_recommendations_endpoint(client):
+    """测试营养建议 API"""
+    response = client.get("/api/nutrition/recommendations")
+    assert response.status_code == 200
+    data = response.json()
+    assert "daily_targets" in data
+    assert "today_intake" in data
+    assert "gaps" in data
+    assert "suggestions" in data