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94cab38206
The query string already lives in req->uri. Access it via strchr('?')
instead of copying into a 513-byte stack buffer via httpd_req_get_url_query_str.
This is the same pattern url_to() uses — http_parser identifies URI
components by offset/length without modifying the source string.
Eliminates 513 bytes of stack usage on the httpd task, leaving only
the 128-byte value extraction buffer in query_key_value.
