Fix: embedding model failure in CometAPI (#10137)

### What problem does this PR solve?

Related PR:
Feat: add CometAPI to LLMFactory and update related mappings #10119 

Change:
Fixes the issue where the embedding model in CometAPI was not being
called correctly

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: TensorNull <tensor.null@gmail.com>

rag/llm/embedding_model.py

@@ -86,6 +86,7 @@ class DefaultEmbedding(Base):
             with DefaultEmbedding._model_lock:
                 import torch
                 from FlagEmbedding import FlagModel
+
                 if "CUDA_VISIBLE_DEVICES" in os.environ:
                     input_cuda_visible_devices = os.environ["CUDA_VISIBLE_DEVICES"]
                     os.environ["CUDA_VISIBLE_DEVICES"] = "0"  # handle some issues with multiple GPUs when initializing the model
@@ -472,6 +473,7 @@ class MistralEmbed(Base):
     def encode(self, texts: list):
         import time
         import random
+
         texts = [truncate(t, 8196) for t in texts]
         batch_size = 16
         ress = []
@@ -495,6 +497,7 @@ class MistralEmbed(Base):
     def encode_queries(self, text):
         import time
         import random
+
         retry_max = 5
         while retry_max > 0:
             try:
@@ -942,6 +945,7 @@ class GiteeEmbed(SILICONFLOWEmbed):
             base_url = "https://ai.gitee.com/v1/embeddings"
         super().__init__(key, model_name, base_url)
 
+
 class DeepInfraEmbed(OpenAIEmbed):
     _FACTORY_NAME = "DeepInfra"
 
@@ -960,10 +964,10 @@ class Ai302Embed(Base):
         super().__init__(key, model_name, base_url)
 
 
-class CometEmbed(Base):
+class CometEmbed(OpenAIEmbed):
     _FACTORY_NAME = "CometAPI"
 
-    def __init__(self, key, model_name, base_url="https://api.cometapi.com/v1/embeddings"):
+    def __init__(self, key, model_name, base_url="https://api.cometapi.com/v1"):
         if not base_url:
-            base_url = "https://api.cometapi.com/v1/embeddings"
+            base_url = "https://api.cometapi.com/v1"
         super().__init__(key, model_name, base_url)