diff --git a/MiniApp/Demo/background-remover/AGENTS.md b/MiniApp/Demo/background-remover/AGENTS.md
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+# Background Remover MiniApp
+
+Run the focused checks from the repository root:
+
+```sh
+node MiniApp/Demo/background-remover/source/build.mjs
+python3 MiniApp/Demo/background-remover/source/package.py
+node --test MiniApp/Demo/background-remover/tests/*.test.mjs
+```
+
+After UI or color changes, also run `pnpm run theme:color-audit:all`.
+Edit `source/ui/*.js`, then rebuild the generated `source/ui.js` bundle.
+The standalone HTML is generated under repository-level ignored `output/miniapps/`, separate from host-owned `compiled.html`.
+Do not use Computer Use or browser control for verification unless the user asks.
diff --git a/MiniApp/Demo/background-remover/README.md b/MiniApp/Demo/background-remover/README.md
new file mode 100644
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+# 轻抠 / Background Remover
+
+给图标、Logo 去掉纯色或近似纯色背景，下载真正带 Alpha 通道的透明 PNG。
+所有像素处理都在当前打开页面的设备上完成；不上传图片，不加载模型，不需要网络、账号或 Node Worker。
+
+## 使用
+
+在仓库根目录运行：
+
+```sh
+node MiniApp/Demo/background-remover/source/build.mjs
+```
+
+打开仓库根目录下生成的 `output/miniapps/background-remover.html` 即可离线使用，无需启动服务器。
+
+1. 点击上传、拖入或粘贴一张 PNG、JPG、WebP 图片。
+2. 自动读取图片边缘的主要背景颜色，并显示抠图结果。棋盘格代表真实透明。
+3. 背景未去干净时，在原图上点击背景取色，或调整颜色容差和边缘柔化。
+4. 点击「下载透明 PNG」，保留原图像素尺寸。对比底色只改变预览。
+
+默认只移除与图片四边连通的背景，保留主体内部同色区域。
+需要去掉字母、镂空区域内的背景时，取消勾选该选项；这也可能移除主体内部的同色内容。
+对已有透明边缘的图片，自动模式先保留原图，手动取色后可继续处理。
+
+最大输入为 30 MiB、1600 万像素，单边不超过 8192 像素；超限会明确提示，不会自动缩图。
+适合简单背景；复杂照片、已经烘焙进图片的棋盘格、与背景相连的同色主体无法可靠分离。
+容差过大可能清空图片，此时禁用导出并提示调整设置。
+
+## OpenBitFun MiniApp
+
+**源码文件夹和独立 HTML 不会自动出现在应用列表里，需要先导入。**
+
+在 OpenBitFun 中打开 Mini Apps，点击「导入小应用」→「从文件夹导入」，
+选择本目录 `MiniApp/Demo/background-remover`（含 `meta.json` 的目录，不是 `source` 子目录）。
+客户端会完成安装、编译并更新应用列表；无需把它改成内置应用，也无需重新构建客户端。
+
+也可以在构建后生成安装包：
+
+```sh
+python3 MiniApp/Demo/background-remover/source/package.py
+```
+
+然后在「导入小应用」菜单中导入 `output/miniapps/background-remover.bfminiapp`，
+查看权限并确认。安装包不会发布到市场。
+
+本目录同时包含标准 `meta.json`、`source/index.html`、`source/style.css`、`source/ui.js`、
+`source/worker.js` 和空的 `source/esm_dependencies.json`。
+宿主应通过标准 MiniApp 创建／导入流程读取这些源码并编译；不要把独立 HTML 复制为 `compiled.html`。
+本次交付未调用宿主 `InitMiniApp` / `FinalizeMiniApp`，未安装到用户的 Mini App 列表。
+
+仅申请 `{user-selected}` 写权限，用于 `app.dialog.save` 选择位置后保存 PNG。
+图片输入来自页面文件选择器、拖拽或粘贴，不读取工作区、宿主路径或任意目录。
+在 OpenBitFun 中保存使用 `app.fs.writeFile`；独立 HTML 使用页面下载。
+不支持文件保存的宿主会显示明确提示。
+随宿主切换明暗主题和中英文；独立版也提供语言和主题切换。
+
+## 开发与验证
+
+```sh
+node MiniApp/Demo/background-remover/source/build.mjs
+node --test MiniApp/Demo/background-remover/tests/*.test.mjs
+pnpm run theme:color-audit:all
+```
+
+编辑 `source/ui/*.js` 后重新构建，`source/ui.js` 为生成入口。
+算法测试覆盖背景识别、边缘连通、封闭区域、既有透明度、柔化和去色边、取消处理。
+未使用浏览器控制或 Computer Use 验证界面。
+
+远程场景：本应用不调用工作区、Agent Runtime 或命令执行接口，像素处理不依赖宿主文件系统。
+远程工作区、远程控制、Peer Device Mode 和 Detached Dispatch 均未做端到端验证；
+不据本地算法测试宣称这些宿主支持图片上传、保存或独立运行界面。
+
+## English
+
+Build using the command above, then open `output/miniapps/background-remover.html` from the repository root locally.
+Upload, drop, or paste an icon, pick its background color if necessary, adjust tolerance and edge softness,
+and download a transparent PNG at the original resolution. Processing stays on the viewing device.
+Edge-connected removal preserves enclosed foreground regions; disable it to remove matching colors inside holes.
+This tool targets solid or near-solid backgrounds rather than complex photographic segmentation.
diff --git a/MiniApp/Demo/background-remover/meta.json b/MiniApp/Demo/background-remover/meta.json
new file mode 100644
index 0000000000..c2e15800ac
--- /dev/null
+++ b/MiniApp/Demo/background-remover/meta.json
@@ -0,0 +1,31 @@
+{
+ "id": "background-remover",
+ "name": "轻抠",
+ "description": "为图标和 Logo 去除纯色或近似纯色背景。图片仅在当前设备处理，支持背景取色、容差调整和透明 PNG 导出。",
+ "icon": "Scissors",
+ "category": "creative",
+ "tags": ["image", "background", "transparent", "icon"],
+ "version": 1,
+ "created_at": 0,
+ "updated_at": 0,
+ "permissions": {
+ "fs": { "read": [], "write": ["{user-selected}"] },
+ "shell": { "allow": [] },
+ "net": { "allow": [] },
+ "node": { "enabled": false }
+ },
+ "i18n": {
+ "locales": {
+ "zh-CN": {
+ "name": "轻抠",
+ "description": "图标、Logo 简单背景抠图，自动识别背景、手动取色，本地导出透明 PNG。",
+ "tags": ["图片", "抠图", "透明背景", "图标"]
+ },
+ "en-US": {
+ "name": "Background Remover",
+ "description": "Remove simple backgrounds from icons and logos, pick a background color, and export transparent PNGs locally.",
+ "tags": ["image", "background removal", "transparent", "icon"]
+ }
+ }
+ }
+}
diff --git a/MiniApp/Demo/background-remover/package.json b/MiniApp/Demo/background-remover/package.json
new file mode 100644
index 0000000000..a21bcb5ffd
--- /dev/null
+++ b/MiniApp/Demo/background-remover/package.json
@@ -0,0 +1,8 @@
+{
+ "name": "miniapp-background-remover",
+ "private": true,
+ "scripts": {
+ "build": "node source/build.mjs",
+ "test": "node --test tests/*.test.mjs"
+ }
+}
diff --git a/MiniApp/Demo/background-remover/source/build.mjs b/MiniApp/Demo/background-remover/source/build.mjs
new file mode 100644
index 0000000000..e9a0ece649
--- /dev/null
+++ b/MiniApp/Demo/background-remover/source/build.mjs
@@ -0,0 +1,25 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const sourceRoot = path.dirname(fileURLToPath(import.meta.url));
+const appRoot = path.dirname(sourceRoot);
+const repoRoot = path.resolve(appRoot, '../../..');
+const inputs = ['ui/core.js', 'ui/i18n.js', 'ui/main.js'];
+const bundle = inputs.map(file => `/* ${file} */\n${fs.readFileSync(path.join(sourceRoot, file), 'utf8')}\n`).join('');
+fs.writeFileSync(path.join(sourceRoot, 'ui.js'), bundle);
+
+// This is an offline user deliverable, not the host-managed compiled.html.
+// Reuse the canonical first-paint projection instead of creating another palette.
+const appearance = fs.readFileSync(path.join(repoRoot,
+ 'src/crates/contracts/product-domains/src/miniapp/generated/default_appearance_style.html'), 'utf8');
+const css = fs.readFileSync(path.join(sourceRoot, 'style.css'), 'utf8');
+const html = fs.readFileSync(path.join(sourceRoot, 'index.html'), 'utf8');
+const escapeScript = script => script.replace(/<\/script/gi, '<\\/script');
+const standalone = html
+ .replace('', `${appearance}\n\n`)
+ .replace(' ', `\n`);
+const outputDir = path.join(repoRoot, 'output', 'miniapps');
+fs.mkdirSync(outputDir, { recursive: true });
+fs.writeFileSync(path.join(outputDir, 'background-remover.html'), standalone);
+console.log('Built MiniApp source/ui.js and standalone output/miniapps/background-remover.html');
diff --git a/MiniApp/Demo/background-remover/source/esm_dependencies.json b/MiniApp/Demo/background-remover/source/esm_dependencies.json
new file mode 100644
index 0000000000..fe51488c70
--- /dev/null
+++ b/MiniApp/Demo/background-remover/source/esm_dependencies.json
@@ -0,0 +1 @@
+[]
diff --git a/MiniApp/Demo/background-remover/source/index.html b/MiniApp/Demo/background-remover/source/index.html
new file mode 100644
index 0000000000..4bc4624026
--- /dev/null
+++ b/MiniApp/Demo/background-remover/source/index.html
@@ -0,0 +1,91 @@
+
+
+