feat: 添加联系我们配置接口和字典配置缓存

1. 新增DictionaryItem字典配置结构体
2. 添加字典配置缓存及失效逻辑
3. 实现联系我们接口的业务逻辑和测试用例
4. 注册联系我们API路由
5. 集成字典配置到admin内部客户端
6. 处理字典配置更新的kafka事件

server/im_http_test.go

@@ -8266,3 +8266,69 @@ func TestIMMessageTypeDraftyEntities(t *testing.T) {
 		}
 	}
 }
+
+type testDictionaryStore struct {
+	items []types.DictionaryItem
+	err   error
+}
+
+func (s *testDictionaryStore) Get(_ string) ([]types.DictionaryItem, error) {
+	if s.err != nil {
+		return nil, s.err
+	}
+	return s.items, nil
+}
+
+func TestServeIMContactUs(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	expectIMBearer(t, ctrl, "token-1", 7, 42)
+	oldDict := store.DictionaryConfig
+	defer func() { store.DictionaryConfig = oldDict }()
+
+	store.DictionaryConfig = &testDictionaryStore{items: []types.DictionaryItem{
+		{Label: "客服邮箱", Value: "support@example.com", Sort: 10},
+		{Label: "客服电话", Value: "+86 400-000-0000", Sort: 20},
+	}}
+	req := httptest.NewRequest(http.MethodGet, "/v1/im/contact-us", nil)
+	req.Header.Set("Authorization", "Bearer token-1")
+	rec := httptest.NewRecorder()
+	serveIMContactUs(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status: got %d body=%s", rec.Code, rec.Body.String())
+	}
+	resp := decodeIMHTTPResponse(t, rec)
+	items, ok := resp.Data.(map[string]any)["items"].([]any)
+	if !ok || len(items) != 2 {
+		t.Fatalf("unexpected items: %#v", resp.Data)
+	}
+	if items[0].(map[string]any)["label"] != "客服邮箱" || items[1].(map[string]any)["value"] != "+86 400-000-0000" {
+		t.Fatalf("item mismatch: %#v", items)
+	}
+
+	store.DictionaryConfig = &testDictionaryStore{err: types.ErrUnsupported}
+	rec = httptest.NewRecorder()
+	serveIMContactUs(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("unsupported status: got %d body=%s", rec.Code, rec.Body.String())
+	}
+	resp = decodeIMHTTPResponse(t, rec)
+	if listed, ok := resp.Data.(map[string]any)["items"].([]any); !ok || len(listed) != 0 {
+		t.Fatalf("expected empty items, got %#v", resp.Data)
+	}
+
+	store.DictionaryConfig = &testDictionaryStore{err: types.ErrInternal}
+	rec = httptest.NewRecorder()
+	serveIMContactUs(rec, req)
+	if rec.Code != http.StatusInternalServerError {
+		t.Fatalf("error status: got %d body=%s", rec.Code, rec.Body.String())
+	}
+
+	req = httptest.NewRequest(http.MethodPost, "/v1/im/contact-us", nil)
+	req.Header.Set("Authorization", "Bearer token-1")
+	rec = httptest.NewRecorder()
+	serveIMContactUs(rec, req)
+	if rec.Code != http.StatusMethodNotAllowed {
+		t.Fatalf("method status: got %d body=%s", rec.Code, rec.Body.String())
+	}
+}