feat(admin): UI-01 embed slot config form and live preview

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/admin/src/locales/langs/en.json

@@ -739,7 +739,16 @@
       "langZh": "Chinese",
       "langEn": "English",
       "collapsedLabel": "Collapsed by default",
-      "collapsedHint": "Show a small handle first; click to expand"
+      "collapsedHint": "Show a small handle first; click to expand",
+      "imageFitLabel": "Image fit",
+      "imageFitContain": "Fit (contain)",
+      "imageFitCover": "Fill & crop (cover)",
+      "offsetXLabel": "Horizontal offset",
+      "offsetBottomLabel": "Bottom offset",
+      "zIndexLabel": "Layer (z-index)",
+      "pxUnitOffsetX": "px (0-120)",
+      "pxUnitOffsetBottom": "px (0-240)",
+      "dirtyTag": "Unsaved"
     },
     "create": {
       "title": "New Embed Slot",
@@ -775,8 +784,24 @@
       "copy": "Copy",
       "copied": "Embed code copied",
       "hint": "Paste the code into the host page to mount the floating carousel; later rebinding or toggling never requires changing this code.",
+      "overrideHint": "Only explicitly overridden non-default fields are included (data-*); the rest follow the backend configuration, so backend changes apply without touching this code.",
       "close": "Close"
     },
+    "preview": {
+      "title": "Live preview",
+      "hint": "Local mock data (no API calls, nothing written to the slot); form edits show up immediately and only take effect online after clicking Save.",
+      "desktop": "Desktop preview",
+      "mobile": "Mobile preview (narrow screen)",
+      "badge": "Preview",
+      "chatMock": "Live chat",
+      "collapsedHint": "Narrow screens (<480px) force the small size and collapse by default",
+      "widgetTitle": "Event photos",
+      "handleText": "Photos",
+      "collapseLabel": "Collapse preview",
+      "viewAlbum": "View album",
+      "photoLabel": "Sample photo {n}",
+      "mockAlbumTitle": "Event Album"
+    },
     "toast": {
       "enabledOn": "Enabled (configVersion increased to {version})",
       "enabledOff": "Disabled (configVersion increased to {version}; public feed returns 404)"

apps/admin/src/locales/langs/zh.json

@@ -739,7 +739,16 @@
       "langZh": "中文",
       "langEn": "英文",
       "collapsedLabel": "默认收起",
-      "collapsedHint": "初始仅展示小把手，点击展开"
+      "collapsedHint": "初始仅展示小把手，点击展开",
+      "imageFitLabel": "图片适配",
+      "imageFitContain": "完整展示（contain）",
+      "imageFitCover": "裁切填满（cover）",
+      "offsetXLabel": "水平偏移",
+      "offsetBottomLabel": "底部偏移",
+      "zIndexLabel": "层级",
+      "pxUnitOffsetX": "像素（0-120）",
+      "pxUnitOffsetBottom": "像素（0-240）",
+      "dirtyTag": "未保存"
     },
     "create": {
       "title": "新建展示位",
@@ -775,8 +784,24 @@
       "copy": "复制",
       "copied": "已复制嵌入代码",
       "hint": "将代码粘贴到官网页面即可挂载悬浮轮播；后续换绑相册、启停均无需改动该代码。",
+      "overrideHint": "代码仅包含显式设置的非默认字段（data-* 覆盖）；其余字段以后台配置为准，后台修改即生效，无需改动此代码。",
       "close": "关闭"
     },
+    "preview": {
+      "title": "实时预览",
+      "hint": "本地示例数据（不调用接口、不写展示位）；表单修改即时反映，点击「保存」后才更新线上配置。",
+      "desktop": "桌面预览",
+      "mobile": "手机预览（窄屏）",
+      "badge": "预览",
+      "chatMock": "在线客服",
+      "collapsedHint": "窄屏（<480px）强制小尺寸并默认收起",
+      "widgetTitle": "活动照片",
+      "handleText": "照片",
+      "collapseLabel": "收起预览",
+      "viewAlbum": "查看相册",
+      "photoLabel": "示例照片 {n}",
+      "mockAlbumTitle": "活动相册"
+    },
     "toast": {
       "enabledOn": "已启用（configVersion 已递增至 {version}）",
       "enabledOff": "已停用（configVersion 已递增至 {version}，公开端随即 404）"