Cron origin fallback extension (builds on #9193's _HOME_TARGET_ENV_VARS):
adds the three remaining origin-fallback-eligible platforms that have
home channel env vars configured in gateway/config.py but use non-generic
env var names:
- email → EMAIL_HOME_ADDRESS (non-standard suffix)
- dingtalk → DINGTALK_HOME_CHANNEL
- qqbot → QQ_HOME_CHANNEL (non-standard prefix: QQ_ not QQBOT_)
Picks up the completeness intent of @Xowiek's PR #11317 using the
architecturally-correct dict-based lookup from #9193, so platforms with
non-standard env var names actually resolve instead of silently missing.
Extended the parametrized regression test to cover the new three.
Weixin test mock alignment (builds on #10091's _send_session split):
Three test sites added in Batch 1 (TestWeixinSendImageFileParameterName)
and Batch 3 (TestWeixinVoiceSending) mocked only adapter._session, but
#10091 switched the send paths to check self._send_session. Added the
companion setter so the tests stay green with the session split in place.
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