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)

src/main/capabilities/browser.ts

@@ -1,6 +1,6 @@
 import { register } from "../engine/registry";
 import { RuntimeError } from "../engine/types";
-import { browserSession } from "../browser/session";
+import { browserSession, externalBrowserSession } from "../browser/session";
 import type { BrowserLike, RunContext } from "../engine/types";
 
 async function session(ctx: RunContext): Promise<BrowserLike> {
@@ -8,6 +8,56 @@ async function session(ctx: RunContext): Promise<BrowserLike> {
   return ctx.browser;
 }
 
+function isTruthyFlag(value: unknown): boolean {
+  const text = String(value ?? "").trim().toLowerCase();
+  return text === "1" || text === "true" || text === "yes";
+}
+
+/**
+ * 「打开网页」浏览器选择：
+ * - type 填 chrome / edge → 拉起本机对应浏览器（带独立 profile + 调试端口）并接管
+ * - isRemote 填 1/true → 直连 ipAddress:port 上已监听调试端口的实例（不拉起进程）
+ * - type 缺省或其他值 → 内置运行浏览器（现状行为，兜底）
+ */
+async function resolveSession(ctx: RunContext, args: Record<string, unknown>): Promise<{ browser: BrowserLike; label: string }> {
+  if (ctx.browser) return { browser: ctx.browser, label: "" };
+  const type = String(args.type ?? "").trim().toLowerCase();
+  const isRemote = isTruthyFlag(args.isRemote);
+  if (isRemote) {
+    const host = String(args.ipAddress ?? "127.0.0.1");
+    const port = Number(args.port ?? 9222);
+    const browser = await externalBrowserSession({ mode: "remote", host, port });
+    ctx.browser = browser;
+    return { browser, label: browser.label };
+  }
+  if (type === "chrome" || type === "edge") {
+    const extraArgs = String(args.arguments ?? "")
+      .split(/\s+/)
+      .map((item) => item.trim())
+      .filter(Boolean);
+    const browser = await externalBrowserSession({
+      mode: "launch",
+      browserType: type === "edge" ? "edge" : "chrome",
+      port: Number(args.port ?? 9222) || 9222,
+      extraArgs
+    });
+    ctx.browser = browser;
+    return { browser, label: browser.label };
+  }
+  return { browser: await session(ctx), label: "内置运行浏览器" };
+}
+
+register(["WebBrowser_CreateV3", "WebBrowser_CreateV2", "WebBrowser_Create", "WebBrowser_CreateBackground"], async (ctx, node, args) => {
+  const { browser, label } = await resolveSession(ctx, args);
+  const url = String(args.url ?? "");
+  if (url) {
+    const result = await browser.navigate(url);
+    ctx.log(`已使用${label}打开 ${result.url}`, "info", node.id);
+    return result;
+  }
+  return { url: await browser.currentUrl(), title: "" };
+});
+
 function selectorOf(args: Record<string, unknown>): unknown {
   const selector = args.uiSelector ?? args.selector ?? args.target ?? args.uiWindowSelector;
   if (selector === undefined || selector === null || selector === "") {
@@ -18,17 +68,6 @@ function selectorOf(args: Record<string, unknown>): unknown {
   return selector;
 }
 
-register(["WebBrowser_CreateV3", "WebBrowser_CreateV2", "WebBrowser_Create", "WebBrowser_CreateBackground"], async (ctx, node, args) => {
-  const browser = await session(ctx);
-  const url = String(args.url ?? "");
-  if (url) {
-    const result = await browser.navigate(url);
-    ctx.log(`已打开 ${result.url}`, "info", node.id);
-    return result;
-  }
-  return { url: await browser.currentUrl(), title: "" };
-});
-
 register(["WebBrowser_GoUrl", "WebBrowser_Navigate"], async (ctx, node, args) => {
   const browser = await session(ctx);
   const url = String(args.url ?? "");