fix(wecomai_event): 修复消息链提取纯文本时的空白处理

[NayukiChiba]

Modifications / 改动点

• 增加了strip_result参数以控制是否需要去除首尾空白
• 如果是非流式输出，保持为默认为True，表示保留换行，进行strip，丢掉\n
• 如果是流式，表示不需要strip，跳过strip，保留\n
• 流式输出时保留换行等格式字符
• 更新相关调用以适应新参数

close #8474

• 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

test session starts 
platform win32 -- Python 3.12.12, pytest-9.0.3, pluggy-1.6.0
rootdir: D:\Nayey\Code\NayukiChiba\Astrbot
configfile: pyproject.toml
plugins: anyio-4.13.0, asyncio-1.4.0, cov-7.1.0
asyncio: mode=Mode.STRICT, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
collected 24 items                                                                                        

tests\unit\test_wecomai_event.py ........................                                           [100%]
24 passed in 2.13s

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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。

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• Consider making strip_result a keyword-only argument in _extract_plain_text_from_chain (e.g., def _extract_plain_text_from_chain(message_chain: MessageChain | None, *, strip_result: bool = True)) to avoid accidental positional misuse and make its semantics clearer at call sites.
• The new tests around _extract_plain_text_from_chain are quite granular and repetitive; you could reduce duplication and improve readability by parametrizing similar cases (e.g., whitespace/newline/tab behaviors) with pytest.mark.parametrize instead of separate test functions.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider making `strip_result` a keyword-only argument in `_extract_plain_text_from_chain` (e.g., `def _extract_plain_text_from_chain(message_chain: MessageChain | None, *, strip_result: bool = True)`) to avoid accidental positional misuse and make its semantics clearer at call sites.
- The new tests around `_extract_plain_text_from_chain` are quite granular and repetitive; you could reduce duplication and improve readability by parametrizing similar cases (e.g., whitespace/newline/tab behaviors) with `pytest.mark.parametrize` instead of separate test functions.

## Individual Comments

### Comment 1
<location path="tests/unit/test_wecomai_event.py" line_range="15-24" />
<code_context>
+
+# ============================================================
+# strip_result 参数类型安全测试
+# ============================================================
+
+
+def test_strip_result_param_is_explicit():
+    """strip_result 是显式关键字参数，不影响位置参数调用"""
+    chain = MessageChain([Plain("测试")])
+    # 不传 strip_result，使用默认值 True
+    result1 = WecomAIBotMessageEvent._extract_plain_text_from_chain(chain)
+    # 显式传 strip_result=True
+    result2 = WecomAIBotMessageEvent._extract_plain_text_from_chain(chain, True)
+    assert result1 == result2 == "测试"
+
+
+def test_strip_result_false_prevents_whitespace_loss():
+    """验证 strip_result 参数机制：False 时保留空白，True 时去除"""
+    text = "  内容  "
+    chain = MessageChain([Plain(text)])
+
+    stripped = WecomAIBotMessageEvent._extract_plain_text_from_chain(chain, True)
+    notStripped = WecomAIBotMessageEvent._extract_plain_text_from_chain(chain, False)
+
+    assert stripped == "内容"
+    assert notStripped == "  内容  "
+    assert stripped != notStripped
</code_context>
<issue_to_address>
**issue (testing):** Add end-to-end tests around `send_streaming` / `enqueue_stream_plain` to ensure they actually use `strip_result=False` and preserve newlines in real flows.

Current tests validate `_extract_plain_text_from_chain` directly, but the original regression was in the streaming callers (`send_streaming` / `enqueue_stream_plain`) where `strip_result=False` is passed. If that argument is later removed or changed at the call sites, these tests could still pass.

Please add at least one async test for each of `send_streaming` and `enqueue_stream_plain` that:
- sends chunked content with `\n` (and optionally `\t`) through the real streaming path,
- inspects the final text or mocked downstream payload,
- asserts that newlines and formatting characters are preserved.

That will protect the actual streaming behavior, not just the helper function.
</issue_to_address>

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[gemini-code-assist]

Code Review

This pull request introduces a strip_result parameter to _extract_plain_text_from_chain in wecomai_event.py to allow preserving formatting and newlines during streaming, and adds comprehensive unit tests to verify this behavior. The feedback suggests renaming a variable in the tests to comply with PEP 8 naming conventions.

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