feat(group): 增加messages调度模型映射配置

backend/internal/service/openai_messages_dispatch_test.go

@@ -0,0 +1,27 @@
+package service
+
+import "testing"
+
+import "github.com/stretchr/testify/require"
+
+func TestNormalizeOpenAIMessagesDispatchModelConfig(t *testing.T) {
+	t.Parallel()
+
+	cfg := normalizeOpenAIMessagesDispatchModelConfig(OpenAIMessagesDispatchModelConfig{
+		OpusMappedModel:   " gpt-5.4-high ",
+		SonnetMappedModel: "gpt-5.3-codex",
+		HaikuMappedModel:  " gpt-5.4-mini-medium ",
+		ExactModelMappings: map[string]string{
+			" claude-sonnet-4-5-20250929 ": " gpt-5.2-high ",
+			"":                             "gpt-5.4",
+			"claude-opus-4-6":              " ",
+		},
+	})
+
+	require.Equal(t, "gpt-5.4", cfg.OpusMappedModel)
+	require.Equal(t, "gpt-5.3-codex", cfg.SonnetMappedModel)
+	require.Equal(t, "gpt-5.4-mini", cfg.HaikuMappedModel)
+	require.Equal(t, map[string]string{
+		"claude-sonnet-4-5-20250929": "gpt-5.2",
+	}, cfg.ExactModelMappings)
+}