Feat: implement novitaAI embedding and reranking. (#8250)

### What problem does this PR solve?

Close #8227

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

rag/llm/__init__.py

@@ -45,6 +45,7 @@ from .embedding_model import (
     HuggingFaceEmbed,
     VolcEngineEmbed,
     GPUStackEmbed,
+    NovitaEmbed
 )
 from .chat_model import (
     GptTurbo,
@@ -128,6 +129,7 @@ from .rerank_model import (
     QWenRerank,
     GPUStackRerank,
     HuggingfaceRerank,
+    NovitaRerank
 )
 
 from .sequence2txt_model import (
@@ -180,6 +182,7 @@ EmbeddingModel = {
     "HuggingFace": HuggingFaceEmbed,
     "VolcEngine": VolcEngineEmbed,
     "GPUStack": GPUStackEmbed,
+    "NovitaAI": NovitaEmbed
 }
 
 CvModel = {
@@ -267,6 +270,7 @@ RerankModel = {
     "Tongyi-Qianwen": QWenRerank,
     "GPUStack": GPUStackRerank,
     "HuggingFace": HuggingfaceRerank,
+    "NovitaAI": NovitaRerank
 }
 
 Seq2txtModel = {

rag/llm/embedding_model.py

@@ -913,3 +913,8 @@ class GPUStackEmbed(OpenAIEmbed):
 
         self.client = OpenAI(api_key=key, base_url=base_url)
         self.model_name = model_name
+
+
+class NovitaEmbed(SILICONFLOWEmbed):
+    def __init__(self, key, model_name, base_url="https://api.novita.ai/v3/openai/embeddings"):
+        super().__init__(key, model_name, base_url)

rag/llm/rerank_model.py

@@ -626,3 +626,7 @@ class GPUStackRerank(Base):
             raise ValueError(
                 f"Error calling GPUStackRerank model {self.model_name}: {e.response.status_code} - {e.response.text}")
 
+
+class NovitaRerank(JinaRerank):
+    def __init__(self, key, model_name, base_url="https://api.novita.ai/v3/openai/rerank"):
+        super().__init__(key, model_name, base_url)