Refactor test cases for assistant updates to improve consistency

- Standardized formatting in TestUpdateAssistant and assistant_update_test.go to enhance readability.
- Ensured comments clearly indicate which fields are ignored during updates, maintaining clarity in test intentions.

agent/store/xun/assistant_test.go

@@ -2173,7 +2173,7 @@ func TestUpdateAssistant(t *testing.T) {
 
 		// Try to update system fields (should be ignored)
 		updates := map[string]interface{}{
-			"assistant_id": "new-id-123",    // Should be ignored
+			"assistant_id": "new-id-123",     // Should be ignored
 			"created_at":   int64(123456789), // Should be ignored
 			"name":         "Valid Update",   // Should be applied
 		}

openapi/tests/agent/assistant_update_test.go

@@ -763,9 +763,9 @@ func TestUpdateAssistant(t *testing.T) {
 				},
 			},
 			"options": map[string]interface{}{
-				"temperature":      0.9,
-				"max_tokens":       4000,
-				"top_p":            0.95,
+				"temperature":       0.9,
+				"max_tokens":        4000,
+				"top_p":             0.95,
 				"frequency_penalty": 0.5,
 			},
 			"workflow": map[string]interface{}{
@@ -1043,4 +1043,3 @@ func BenchmarkUpdateAssistant(b *testing.B) {
 		resp.Body.Close()
 	}
 }
-