feat: 外接浏览器支持阶段一+二（Edge/Chrome 打开与基础自动化）

- 新增 browser/transport.ts: CdpTransport 抽象（Embedded=webContents.debugger / External=ws 直连调试端口）
- 新增 browser/external.ts: Chrome/Edge 路径探测(常见目录+注册表App Paths)、带独立 user-data-dir 与调试端口拉起、端口占用自增、/json/version 就绪轮询、远程连接模式
- session.ts: BrowserSession 改为传输层注入, navigate/currentUrl/download/弹窗/网络监听双模式适配; 外部会话按 (mode,type,port) 缓存复用; pickElement 外部模式明确报不支持(阶段四)
- capabilities/browser.ts: WebBrowser_Create/V2/V3/CreateBackground 读取 type/isRemote/ipAddress/port/arguments; type=chrome/edge 或 isRemote=1 走外部浏览器, 缺省仍走内置兜底
- 依赖: +ws ^8.22.0
- 冒烟已验证: Edge 156 拉起→CDP 连接→Page.navigate+loadEventFired→取标题→截图→setDownloadBehavior→关闭 全通过
- 内置浏览器行为不变(browser.test.ts 21 项回归通过)

package-lock.json

@@ -22,6 +22,7 @@
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
         "tesseract.js": "^7.0.0",
+        "ws": "^8.22.0",
         "zustand": "^5.0.2"
       },
       "devDependencies": {
@@ -31,6 +32,7 @@
         "@types/pngjs": "^6.0.5",
         "@types/react": "^18.3.12",
         "@types/react-dom": "^18.3.1",
+        "@types/ws": "^8.18.2",
         "@vitejs/plugin-react": "^4.7.0",
         "electron": "31.7.7",
         "electron-builder": "^26.15.7",
@@ -3013,6 +3015,16 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/ws": {
+      "version": "8.18.2",
+      "resolved": "https://registry.npmmirror.com/@types/ws/-/ws-8.18.2.tgz",
+      "integrity": "sha512-67MQl+fpWKVTT1NYdnmo3U4sc/xPo/zQBncVnI74qmQa0z/b+1g6iYqNmGCPbxO+zz2aklb08a0oHfegiVd0/w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/yauzl": {
       "version": "2.10.3",
       "resolved": "https://registry.npmmirror.com/@types/yauzl/-/yauzl-2.10.3.tgz",
@@ -10535,6 +10547,27 @@
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "license": "ISC"
     },
+    "node_modules/ws": {
+      "version": "8.22.0",
+      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.22.0.tgz",
+      "integrity": "sha512-Ydggc987+RO0AnWtZ/7Wq9FtNvcrL1b/RO0ud9mWjUPgDrsAAwQSF51sm2hm1XofbU/4jkpGEsLFsZZxU+1DOg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/xmlbuilder": {
       "version": "15.1.1",
       "resolved": "https://registry.npmmirror.com/xmlbuilder/-/xmlbuilder-15.1.1.tgz",