InvisibleFirefoxTool (interest check)

[feder-cr]

hey, before fleshing out the full tool surface i wanted to check if there'd be interest in an InvisibleFirefoxTool parallel to the existing Crawl4aiTool and BrowserUseTool under app/tool/. selected by the user when constructing the agent, no change to defaults.

motivation: existing browser and scraper tools return 403 or empty content when the target site is behind Cloudflare, Akamai, Datadome, or hCaptcha. a Firefox build with fingerprint patches at the C++ source code level avoids the JS-shim detection surface that the standard playwright stealth approach uses.

the tool wraps feder-cr/invisible_playwright, which drives a patched Firefox 150 binary (feder-cr/invisible_firefox, MPL-2.0, same license as Firefox upstream). optional dependency, only imported when the tool is constructed. issues against the backend route to feder-cr/invisible_playwright.

also opened a draft PR #1374 with a stub at app/tool/invisible_firefox.py modeled after the crawl4ai.py shape (PR #1197 precedent for adding scraper tools).

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可选 Firefox 隐身后端工具，作为现有 Crawl4aiTool 和 BrowserUseTool 的并行选项。详细方案见 PR 中的英文说明。