Fix wecom adapter returning json instead of plain text

[Makarov3821]

对#9077 的修复，对于企业微信客服的验证返回纯文本而不是json，以避免回调验证失败

Modifications / 改动点

修改了astrbot/core/platform/sources/wecom/wecom_adapter.py和astrbot/dashboard/api/platform.py两处五行，在reponse输出前进行重整。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Ensure WeCom platform verification callbacks return the expected plain-text HTTP response instead of JSON-wrapped data.

Bug Fixes:

• Return WeCom enterprise customer service verification echo strings as a plain-text HTTP response to satisfy the external callback requirements.

Enhancements:

• Allow the dashboard platform API helper to pass through raw FastAPI Response objects returned by operations instead of always wrapping them in a JSON envelope.

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="astrbot/core/platform/sources/wecom/wecom_adapter.py" line_range="120" />
<code_context>
async def handle_verify(self, request) -> str:
</code_context>
<issue_to_address>
**issue:** Return type annotation no longer matches the actual Response return value.

This function is annotated to return `str` but now returns a `FastAPIResponse`, creating a contract mismatch for callers and type checkers. Please update the return annotation (and any related interfaces) to use the appropriate `Response` type so the signature reflects the actual behavior.
</issue_to_address>

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[gemini-code-assist]

Code Review

This pull request modifies the WeCom adapter to return a FastAPIResponse instead of a plain string during verification, and updates the dashboard API runner to handle Response objects directly. The review feedback correctly suggests updating the return type annotation of handle_verify to FastAPIResponse to ensure type safety and prevent static analysis errors.

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[gemini-code-assist]

由于 handle_verify 方法现在返回的是 FastAPIResponse 对象，建议将该方法的返回类型标注（位于第 101 行：async def handle_verify(self, request) -> str:）更新为 FastAPIResponse，以保持类型声明的准确性，避免静态类型检查工具（如 mypy 或 pyright）报错。

[Makarov3821]

fixed