feat(h5): 小程序原生顶栏 + 本地联调与一键部署

nh=1 隐藏 H5 顶栏并由 cover 承载 logo；H5 仅 4px 顶距避免重复留白。新增 dev:mp、deploy:h5 与联调文档。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/user-h5/src/lib/mpEmbed.spec.ts

@@ -1,5 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it } from 'vitest'
-import { applyMpEmbedDom, initMpEmbed, isMpEmbed } from './mpEmbed'
+import { applyMpEmbedDom, initMpEmbed, isMpEmbed, isMpNativeHeader } from './mpEmbed'
 
 describe('mpEmbed', () => {
   beforeEach(() => {
@@ -28,6 +28,15 @@ describe('mpEmbed', () => {
     expect(document.documentElement.style.getPropertyValue('--yxg-safe-top')).toBe('47px')
   })
 
+  it('uses native mini-program header mode with ?nh=1', () => {
+    window.history.replaceState({}, '', '/psy/?mp=1&nh=1')
+    initMpEmbed()
+    expect(isMpNativeHeader()).toBe(true)
+    expect(document.documentElement.classList.contains('mp-native-header')).toBe(true)
+    expect(document.documentElement.style.getPropertyValue('--yxg-safe-top')).toBe('0px')
+    expect(document.documentElement.style.getPropertyValue('--yxg-page-top')).toBe('4px')
+  })
+
   it('returns false without mp query', () => {
     initMpEmbed()
     expect(isMpEmbed()).toBe(false)