fix(wecom): read media_id instead of media in send_message()

[AmirF194]

概述 / Overview

WecomAdapter.send_message(), the entry point plugins use via PluginToRuntimeAction.SEND_MESSAGE, raises KeyError: 'media' for any image, voice, or file message part.

WecomMessageConverter.yiri2target() always builds these parts as {'type': 'image'|'voice'|'file', 'media_id': ...} (only ever media_id), and the sibling method reply_message() reads that key correctly. send_message() instead reads content['media'], a key that is never produced, so the call raises before reaching self.bot.send_image/send_voice/send_file.

This fixes the plugin.send_message symptom in #1687 (falls back to sending the unprocessed text because the call raises). The event_context.reply multi-part msg_id duplicate symptom in the same issue is a different, unconfirmed mechanism (a WeCom-side same-msg_id reply constraint, not this key mismatch) and is out of scope here.

检查清单 / Checklist

PR 作者完成 / For PR author

• 阅读仓库贡献指引了吗？ / Have you read the contribution guide?
• 我已签署或将在机器人提示后签署 CLA。 / I have signed, or will sign when prompted by the bot, the CLA.
• 与项目所有者沟通过了吗？ / Have you communicated with the project maintainer?
• 我确定已自行测试所作的更改，确保功能符合预期。 / I have tested the changes and ensured they work as expected.

Verification

• New test tests/unit_tests/platform/test_wecom_send_message.py fails on unmodified HEAD (KeyError: 'media' for image/voice/file) and passes after the fix; text-only send is covered too.
• uv run pytest tests/unit_tests/ tests/smoke/ (Python 3.12): 2788 passed, 1 skipped. tests/unit_tests/platform/ also re-run clean on Python 3.11 and 3.13.
• uv run ruff check / ruff format --check: clean.
• Not verified: an actual WeCom self-built-app account (no test tenant available here), and the separate msg_id-duplicate symptom in [Bug]: 企业微信图文消息集合只能发送第一个消息后续的消息报错MSG_ID重复 #1687.

[github-actions]

All contributors have signed the CLA. ✅ 所有贡献者均已签署 CLA。
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[AmirF194]

I have read the CLA Document and I hereby sign the CLA

[RockChinQ]

Hi. Please provide screenshots to prove the changes work.

[AmirF194]

I don't have a live WeCom self-built-app tenant to capture a real screenshot, sorry, that's a real gap in the PR body too.

What I do have: a regression test (tests/unit_tests/platform/test_wecom_send_message.py) that reproduces the exact KeyError: 'media' on unmodified HEAD for image/voice/file sends, and passes after the one-line key fix (content['media'] -> content['media_id']), covering text-only sends too. If a screenshot from an actual tenant is a hard requirement here, I understand holding the PR until someone with WeCom access can confirm it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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