fix: 修复工作流开始表单文案清空回退

- 保留标题和说明的显式空值

- 同步运行页与后端解析逻辑

easyflow-modules/easyflow-module-ai/src/main/java/tech/easyflow/ai/easyagentsflow/service/WorkflowRunningParameterResolver.java

@@ -118,12 +118,29 @@ public class WorkflowRunningParameterResolver {
     private Map<String, Object> resolveStartFormMeta(JSONObject startNodeData) {
         JSONObject rawMeta = startNodeData == null ? null : startNodeData.getJSONObject("startFormMeta");
         Map<String, Object> meta = new LinkedHashMap<>();
-        meta.put("title", trimToDefault(rawMeta == null ? null : rawMeta.getString("title"), DEFAULT_START_FORM_TITLE));
-        meta.put("description", trimToDefault(rawMeta == null ? null : rawMeta.getString("description"), DEFAULT_START_FORM_DESCRIPTION));
+        // Missing values use defaults; an explicit empty string means the user cleared the field.
+        meta.put("title", resolveOptionalStartFormText(rawMeta, "title", DEFAULT_START_FORM_TITLE));
+        meta.put("description", resolveOptionalStartFormText(rawMeta, "description", DEFAULT_START_FORM_DESCRIPTION));
         meta.put("submitText", trimToDefault(rawMeta == null ? null : rawMeta.getString("submitText"), DEFAULT_START_FORM_SUBMIT_TEXT));
         return meta;
     }
 
+    /**
+     * 解析允许用户主动清空的开始表单文案。
+     *
+     * @param meta 开始节点表单元数据
+     * @param key 文案字段名
+     * @param fallback 字段缺失时的默认文案
+     * @return 配置文案；字段缺失时返回默认文案，显式空字符串保持为空
+     */
+    private String resolveOptionalStartFormText(JSONObject meta, String key, String fallback) {
+        if (meta == null || !meta.containsKey(key)) {
+            return fallback;
+        }
+        String value = meta.getString(key);
+        return value == null ? "" : value.trim();
+    }
+
     private List<Map<String, Object>> resolveStartFormSchema(JSONObject startNodeData, List<Parameter> parameters) {
         JSONArray rawSchema = startNodeData == null ? null : startNodeData.getJSONArray("startFormSchema");
         List<Map<String, Object>> schema = new ArrayList<>();