Synchronize with enterprise version (#4325)

### Type of change

- [x] Refactoring

rag/llm/tts_model.py

@@ -299,8 +299,6 @@ class SparkTTS:
             yield audio_chunk
 
 
-
-
 class XinferenceTTS:
     def __init__(self, key, model_name, **kwargs):
         self.base_url = kwargs.get("base_url", None)
@@ -330,3 +328,30 @@ class XinferenceTTS:
         for chunk in response.iter_content(chunk_size=1024):
             if chunk:
                 yield chunk
+
+
+class OllamaTTS(Base):
+    def __init__(self, key, model_name="ollama-tts", base_url="https://api.ollama.ai/v1"):
+        if not base_url: 
+            base_url = "https://api.ollama.ai/v1"
+        self.model_name = model_name
+        self.base_url = base_url
+        self.headers = {
+            "Content-Type": "application/json"
+        }
+
+    def tts(self, text, voice="standard-voice"):
+        payload = {
+            "model": self.model_name,
+            "voice": voice,
+            "input": text
+        }
+
+        response = requests.post(f"{self.base_url}/audio/tts", headers=self.headers, json=payload, stream=True)
+
+        if response.status_code != 200:
+            raise Exception(f"**Error**: {response.status_code}, {response.text}")
+
+        for chunk in response.iter_content():
+            if chunk:
+                yield chunk