Add local AI ollama for security purpose (#226)

Co-authored-by: PhotoPortfolio Developer <developer@photportfolio.local>

config/config.example.json

@@ -107,6 +107,10 @@
     "moonshot": {
       "api_key": "sk-xxx",
       "api_base": ""
+    },
+    "ollama": {
+      "api_key": "",
+      "api_base": "http://localhost:11434/v1"
     }
   },
   "tools": {

pkg/config/config.go

@@ -175,6 +175,7 @@ type ProvidersConfig struct {
 	VLLM          ProviderConfig `json:"vllm"`
 	Gemini        ProviderConfig `json:"gemini"`
 	Nvidia        ProviderConfig `json:"nvidia"`
+	Ollama        ProviderConfig `json:"ollama"`
 	Moonshot      ProviderConfig `json:"moonshot"`
 	ShengSuanYun  ProviderConfig `json:"shengsuanyun"`
 	DeepSeek      ProviderConfig `json:"deepseek"`

pkg/providers/http_provider.go

@@ -53,10 +53,10 @@ func (p *HTTPProvider) Chat(ctx context.Context, messages []Message, tools []Too
 		return nil, fmt.Errorf("API base not configured")
 	}
 
-	// Strip provider prefix from model name (e.g., moonshot/kimi-k2.5 -> kimi-k2.5)
+	// Strip provider prefix from model name (e.g., moonshot/kimi-k2.5 -> kimi-k2.5, groq/openai/gpt-oss-120b -> openai/gpt-oss-120b, ollama/qwen2.5:14b -> qwen2.5:14b)
 	if idx := strings.Index(model, "/"); idx != -1 {
 		prefix := model[:idx]
-		if prefix == "moonshot" || prefix == "nvidia" {
+		if prefix == "moonshot" || prefix == "nvidia" || prefix == "groq" || prefix == "ollama" {
 			model = model[idx+1:]
 		}
 	}
@@ -400,7 +400,15 @@ func CreateProvider(cfg *config.Config) (LLMProvider, error) {
 			if apiBase == "" {
 				apiBase = "https://integrate.api.nvidia.com/v1"
 			}
-
+		case (strings.Contains(lowerModel, "ollama") || strings.HasPrefix(model, "ollama/")) && cfg.Providers.Ollama.APIKey != "":
+			fmt.Println("Ollama provider selected based on model name prefix")
+			apiKey = cfg.Providers.Ollama.APIKey
+			apiBase = cfg.Providers.Ollama.APIBase
+			proxy = cfg.Providers.Ollama.Proxy
+			if apiBase == "" {
+				apiBase = "http://localhost:11434/v1"
+			}
+			fmt.Println("Ollama apiBase:", apiBase)
 		case cfg.Providers.VLLM.APIBase != "":
 			apiKey = cfg.Providers.VLLM.APIKey
 			apiBase = cfg.Providers.VLLM.APIBase