* fix(browserless): send the web_fetch token as a query parameter
fetch_html_with_status put the configured token in the /content JSON body.
Browserless reads the token only from the token query parameter or the
Authorization header, and checks it before reading the body, so with
BROWSERLESS_TOKEN set every web_fetch failed with HTTP 401; against an
instance started without TOKEN the unknown body key failed schema
validation with HTTP 400. capture_screenshot already sent ?token=, so
web_capture worked with the same token.
Both endpoints now take the token from BrowserlessClient._auth_params().
The test that pinned the body token is rewritten, and a stand-in for the
Browserless request gate (query/header auth, no extra body keys) drives
both endpoints through the real httpx request path.
* docs(changelog): reference #6484
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
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