fix(weixin,wecom,matrix): respect system proxy via aiohttp trust_env

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>

gateway/platforms/matrix.py

@@ -782,7 +782,7 @@ class MatrixAdapter(BasePlatformAdapter):
             # Try aiohttp first (always available), fall back to httpx
             try:
                 import aiohttp as _aiohttp
-                async with _aiohttp.ClientSession() as http:
+                async with _aiohttp.ClientSession(trust_env=True) as http:
                     async with http.get(image_url, timeout=_aiohttp.ClientTimeout(total=30)) as resp:
                         resp.raise_for_status()
                         data = await resp.read()

gateway/platforms/wecom.py

@@ -266,7 +266,7 @@ class WeComAdapter(BasePlatformAdapter):
     async def _open_connection(self) -> None:
         """Open and authenticate a websocket connection."""
         await self._cleanup_ws()
-        self._session = aiohttp.ClientSession()
+        self._session = aiohttp.ClientSession(trust_env=True)
         self._ws = await self._session.ws_connect(
             self._ws_url,
             heartbeat=HEARTBEAT_INTERVAL_SECONDS * 2,

gateway/platforms/weixin.py

@@ -935,7 +935,7 @@ async def qr_login(
     if not AIOHTTP_AVAILABLE:
         raise RuntimeError("aiohttp is required for Weixin QR login")
 
-    async with aiohttp.ClientSession() as session:
+    async with aiohttp.ClientSession(trust_env=True) as session:
         try:
             qr_resp = await _api_get(
                 session,
@@ -1134,7 +1134,7 @@ class WeixinAdapter(BasePlatformAdapter):
         except Exception as exc:
             logger.debug("[%s] Token lock unavailable (non-fatal): %s", self.name, exc)
 
-        self._session = aiohttp.ClientSession()
+        self._session = aiohttp.ClientSession(trust_env=True)
         self._token_store.restore(self._account_id)
         self._poll_task = asyncio.create_task(self._poll_loop(), name="weixin-poll")
         self._mark_connected()
@@ -1784,7 +1784,7 @@ async def send_weixin_direct(
     token_store.restore(account_id)
     context_token = token_store.get(account_id, chat_id)
 
-    async with aiohttp.ClientSession() as session:
+    async with aiohttp.ClientSession(trust_env=True) as session:
         adapter = WeixinAdapter(
             PlatformConfig(
                 enabled=True,