feat: 支持工作流对话匿名分享

- 增加免登录公共接口、访客隔离、限流和匿名上传校验

- 分离 SSE 连接与运行生命周期，支持刷新恢复服务端权威状态

- 持久化分享页对话并优化时间线滚动与输入区交互

easyflow-ui-admin/app/src/api/sseRequestLifecycle.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest';
+
+import { isInactiveSseRequest } from './sseRequestLifecycle';
+
+describe('sseRequestLifecycle', () => {
+  it('treats an explicit abort as an inactive request', () => {
+    const controller = new AbortController();
+    controller.abort();
+
+    expect(isInactiveSseRequest(controller.signal, 1, 1)).toBe(true);
+  });
+
+  it('treats a superseded request as inactive', () => {
+    const controller = new AbortController();
+
+    expect(isInactiveSseRequest(controller.signal, 2, 1)).toBe(true);
+    expect(isInactiveSseRequest(controller.signal, 1, 1)).toBe(false);
+  });
+});