fix: resolve CI issues - clean up unused imports and fix linting errors

app/src/git_commit_generator/ollama_client.py

@@ -109,7 +109,7 @@ class OllamaClient:
             List of available models with their details.
         """
         try:
-            response = ollama_client.list()
+            response = ollama_lib.list()
             return response.get("models", [])
         except Exception:
             return []
@@ -135,7 +135,7 @@ def get_ollama_client(host: str = "http://localhost:11434", model: str = "llama3
 
     Args:
         host: Ollama server URL.
-        model: HTTP_HOST, model to use.
+        model: Default model to use.
 
     Returns:
         OllamaClient instance.