feat(browser): 插件真实坐标点击与页面内容读取(CF-2)

- umt 插件 POST /umt/tabs/{id}/mouse-click:page.mouse.click,跨域 iframe 的 Turnstile 也点得到;click 坐标优先走它,旧镜像退回 elementFromPoint
- 适配器 pageContent(地址 / 标题 / outerHTML / 正文 / navigator.userAgent);setEgress 返回插件出口模式
- mock camofox 增加 Cloudflare 模式(auto / interactive / captcha)与插件鼠标点击

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/adapters/src/browser/camofox-real.test.ts

@@ -27,6 +27,8 @@ function realUpstream(handler: (c: Call) => Reply | undefined) {
     calls.push(call);
     const r =
       handler(call) ??
+      // 真实上游(不带 umt 插件)没有 /umt/* 路由
+      (call.path.startsWith("/umt/") ? { status: 404, json: { error: "Not found" } } : undefined) ??
       (call.path === "/tabs" && call.method === "POST"
         ? { json: { tabId: "t-1", url: `${ORIGIN}/login.php`, httpStatus: 200, navigationOk: true } }
         : { json: { ok: true } });