aiohttp.ClientSession defaults to trust_env=False, ignoring HTTP_PROXY/
HTTPS_PROXY env vars. This causes QR login and all API calls to fail for
users behind a proxy (e.g. Clash in fake-ip mode), which is common in
China where Weixin and WeCom are primarily used.
Added trust_env=True to all aiohttp.ClientSession instantiations that
connect to external hosts (weixin: 3 places, wecom: 1, matrix: 1).
WhatsApp sessions are excluded as they only connect to localhost.
httpx-based adapters (dingtalk, signal, wecom_callback) are unaffected
as httpx defaults to trust_env=True.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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