feat: 加入 web-to-pixso 插件源码

Chrome 扩展，用于从网页提取 DOM 树为 JSON 格式。
核心文件：capture.js（76KB，提取逻辑）

web-to-pixso/pixso-plugin/manifest.json

@@ -0,0 +1,19 @@
+{
+  "identifier": "web-to-pixso",
+  "id": "web-to-pixso-local",
+  "name": "Web to Pixso",
+  "description": "Import a Web to Pixso capture JSON file as editable Pixso layers.",
+  "version": "1.1.1",
+  "api": "1.0.0",
+  "author": "大非",
+  "editorType": ["pixso", "preview"],
+  "main": "./main.js",
+  "ui": "./ui.html",
+  "icon": "./plugin-logo.png",
+  "menu": [
+    {
+      "name": "导入网页采集文件",
+      "command": "import"
+    }
+  ]
+}

web-to-pixso/pixso-plugin/plugin.json

@@ -0,0 +1,35 @@
+{
+  "identifier": "web-to-pixso",
+  "id": "web-to-pixso-local",
+  "name": "Web to Pixso",
+  "description": "Import a Web to Pixso capture JSON file as editable Pixso layers.",
+  "version": "1.1.1",
+  "api": "1.0.0",
+  "author": "大非",
+  "editorType": ["pixso", "preview"],
+  "main": "./main.js",
+  "ui": "./ui.html",
+  "icon": "./plugin-logo.png",
+  "menu": [
+    {
+      "name": "导入网页采集文件",
+      "command": "import"
+    }
+  ],
+  "commands": [
+    {
+      "name": "import",
+      "description": "导入 Web to Pixso 采集文件"
+    }
+  ],
+  "i18nManifest": {
+    "zh-CN": {
+      "name": "Web to Pixso",
+      "description": "导入网页采集文件并生成 Pixso 可编辑图层"
+    },
+    "en-US": {
+      "name": "Web to Pixso",
+      "description": "Import webpage captures as editable Pixso layers"
+    }
+  }
+}