feat: 新增Client简单对话调用

backend/internal/llm/client.go

@@ -1,8 +1,10 @@
 package llm
 
 import (
+	"context"
 	"fmt"
 	"knowledge-graph-backend/internal/config"
+	"log"
 
 	"github.com/tmc/langchaingo/llms"
 	"github.com/tmc/langchaingo/llms/openai"
@@ -26,4 +28,21 @@ func NewClient(cfg config.LLMConfig) (*Client, error) {
     }
 
 	return &Client{config: cfg, llm: model}, nil
+}
+
+// Client简单对话调用
+func (c *Client) Chat(ctx context.Context, messages []llms.MessageContent) (string, error) {
+	resp, err := c.llm.GenerateContent(ctx, messages)
+
+	if err != nil {
+        log.Printf("[ERROR] GenerateContent failed: %v", err)
+        return "", fmt.Errorf("generate content error: %w", err)
+    }
+    if resp == nil || len(resp.Choices) == 0 {
+        log.Printf("[WARN] Response is empty or has no choices")
+        return "", fmt.Errorf("no content choices returned")
+    }
+    log.Printf("[INFO] Chat completed successfully, choice length: %d", len(resp.Choices[0].Content))
+
+	return resp.Choices[0].Content, nil
 }