refactor: Simplify Gemini function parameter handling

- Removed redundant checks for non-empty properties in function parameters.
- Set function parameters to nil when no properties are needed, streamlining the logic for handling Gemini requests.
- Improved code clarity and maintainability by eliminating unnecessary complexity.

relay/channel/gemini/relay-gemini.go

@@ -56,30 +56,12 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) (*GeminiChatReque
 				googleSearch = true
 				continue
 			}
-			// Ensure parameters has non-empty properties
 			if tool.Function.Parameters != nil {
 				params, ok := tool.Function.Parameters.(map[string]interface{})
 				if ok {
 					if props, hasProps := params["properties"].(map[string]interface{}); hasProps {
 						if len(props) == 0 {
-							// Add an empty property if no parameters needed
+							tool.Function.Parameters = nil
-							params["properties"] = map[string]interface{}{
-								"_": map[string]interface{}{
-									"type":        "string",
-									"description": "No parameters needed",
-								},
-							}
-							// Update required field to match the property
-							params["required"] = []string{"_"}
-						} else {
-							// If properties exist, ensure required field matches existing properties
-							existingProps := make([]string, 0)
-							for propName := range props {
-								existingProps = append(existingProps, propName)
-							}
-							if len(existingProps) > 0 {
-								params["required"] = []string{existingProps[0]}
-							}
 						}
 					}
 				}
@@ -105,7 +87,6 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest) (*GeminiChatReque
 			},
 		}
 	}
-
 	if textRequest.ResponseFormat != nil && (textRequest.ResponseFormat.Type == "json_schema" || textRequest.ResponseFormat.Type == "json_object") {
 		geminiRequest.GenerationConfig.ResponseMimeType = "application/json"