feat: P0-2抽纯函数+补a-g断言13组+P1-2编辑器空覆盖守卫

P0-2:
- content-adapter.js: 解耦Node crypto(客户端直引),
  新增mergeCmsItem/normalizeThumbnail/buildPublishPayload
- buildPublishPayload补normalizeCmsList归一(抓到vote_id漏生成真bug)
- check-article-flow.js: 4组->13组断言,覆盖a-g

P1-2:
- editText.vue/smallTitle.vue getContents成功回调加空覆盖守卫
- editSetting封面已统一字符串数组,无需改动

验证: verify.js全绿,h5构建90 JS通过

pages2/editCms/editText.vue

@@ -99,6 +99,16 @@
 						success: async (res) => {
 							let { html, text, delta } = res
 							const oldItem = cms.cmsLst[index]
+							// P1-2 空覆盖守卫（同源 content-adapter.mergeCmsItem）：
+							// editor ready 但内容未 hydrate 时空串会把原文字抹掉
+							const nextText = text || ''
+							const hadContent = Boolean(oldItem.text || oldItem.html)
+							const gotContent = Boolean(nextText || html || (delta && delta.ops && delta.ops.length))
+							if (hadContent && !gotContent) {
+								console.warn('编辑器内容为空，跳过覆盖以防丢稿')
+								await back()
+								return
+							}
 							cms.cmsLst[index] = {
 								...oldItem,
 								text: text || '',

pages2/editCms/smallTitle.vue

@@ -120,6 +120,17 @@
 				if (!cms || !Array.isArray(cms.cmsLst) || !editorCtx.value) return
 				editorCtx.value.getContents({
 					success: async ({ html = '', text = '', delta = { ops: [] } }) => {
+						// P1-2 空覆盖守卫：编辑已有小标题时，空内容直接返回不覆写
+						if (editingIndex.value >= 0 && cms.cmsLst[editingIndex.value]?.type === 'title') {
+							const oldItem = cms.cmsLst[editingIndex.value]
+							const hadContent = Boolean(oldItem.text || oldItem.html)
+							const gotContent = Boolean(text || html || (delta && delta.ops && delta.ops.length))
+							if (hadContent && !gotContent) {
+								console.warn('小标题内容为空，跳过覆盖以防丢稿')
+								await back()
+								return
+							}
+						}
 						if (!text.trim() && !html.trim()) {
 							uni.showToast({ title: '小标题不能为空', icon: 'none' })
 							return