Fix some error

FIX:
    llm_provider.py 102: _model -> model
MOD:
    utility.py 25: add windows termial color print
    text_to_speech.py 29: add windows version
ADD:
    add termcolor in requirements.txt

sources/llm_provider.py

@@ -11,7 +11,7 @@ class Provider:
     def __init__(self, provider_name, model, server_address = "127.0.0.1:5000"):
         self.provider_name = provider_name.lower()
         self.model = model
-        self.server = self.check_address_format(server_address) 
+        self.server = self.check_address_format(server_address)
         self.available_providers = {
             "ollama": self.ollama_fn,
             "server": self.server_fn,
@@ -25,7 +25,7 @@ class Provider:
 
     def check_address_format(self, address):
         """
-        Validate if the address is valid IP. 
+        Validate if the address is valid IP.
         """
         try:
             ip, port = address.rsplit(":", 1)
@@ -35,7 +35,7 @@ class Provider:
         except ValueError as e:
             raise Exception(f"Invalid address format: {e}")
         return address
-    
+
     def respond(self, history, verbose = True):
         """
         Use the choosen provider to generate text.
@@ -61,7 +61,7 @@ class Provider:
         except Exception as e:
             print(f"An error occurred: {e}")
             return False
-    
+
     def server_fn(self, history, verbose = True):
         """
         Use a remote server wit LLM to generate text.
@@ -99,12 +99,12 @@ class Provider:
               thought += chunk['message']['content']
         except ollama.ResponseError as e:
             if e.status_code == 404:
-                ollama.pull(self._model)
+                ollama.pull(self.model)
             if "refused" in str(e):
                 raise Exception("Ollama connection failed. is the server running ?")
             raise e
         return thought
-    
+
     def test_fn(self, history, verbose = True):
         """
         Test function to generate text.
@@ -121,4 +121,4 @@ class Provider:
         echo "Hello world from bash"
         ```
         """
-        return thought
+        return thought