Fix: token num exceed (#10046)

### What problem does this PR solve?

fix text input exceed token num limit when using siliconflow's embedding
model BAAI/bge-large-zh-v1.5 and BAAI/bge-large-en-v1.5, truncate before
input.

### Type of change

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

rag/llm/embedding_model.py

@@ -751,6 +751,10 @@ class SILICONFLOWEmbed(Base):
         token_count = 0
         for i in range(0, len(texts), batch_size):
             texts_batch = texts[i : i + batch_size]
+            if self.model_name in ["BAAI/bge-large-zh-v1.5", "BAAI/bge-large-en-v1.5"]:
+                # limit 512, 340 is almost safe
+                texts_batch = [" " if not text.strip() else truncate(text, 340) for text in texts_batch]
+            else:
                 texts_batch = [" " if not text.strip() else text for text in texts_batch]
 
             payload = {