Detect invalid response from api.siliconflow.cn (#3792)

### What problem does this PR solve?

Detect invalid response from api.siliconflow.cn. Close #2643

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/llm/embedding_model.py

@@ -606,6 +606,8 @@ class SILICONFLOWEmbed(Base):
             "encoding_format": "float",
         }
         res = requests.post(self.base_url, json=payload, headers=self.headers).json()
+        if "data" not in res or not isinstance(res["data"], list) or len(res["data"])!= len(texts):
+            raise ValueError(f"SILICONFLOWEmbed.encode got invalid response from {self.base_url}")
         return (
             np.array([d["embedding"] for d in res["data"]]),
             res["usage"]["total_tokens"],
@@ -618,6 +620,8 @@ class SILICONFLOWEmbed(Base):
             "encoding_format": "float",
         }
         res = requests.post(self.base_url, json=payload, headers=self.headers).json()
+        if "data" not in res or not isinstance(res["data"], list) or len(res["data"])!= 1:
+            raise ValueError(f"SILICONFLOWEmbed.encode_queries got invalid response from {self.base_url}")
         return np.array(res["data"][0]["embedding"]), res["usage"]["total_tokens"]