fix: correct double-escaped regex in Discord slash command validation

[wcqqq1214]

Fixes #9410

The regex used to validate Discord slash command names at discord_platform_adapter.py:568 was double-escaped: r"^[-_'\\w]{1,32}$" makes the regex engine treat \\ as a literal backslash followed by a literal w, instead of the intended \w (Unicode word character) shorthand. As a result the character class only matched the literal characters -, _, ', \, w, so almost every real command name (including plain English ones like help, neko, sid) failed validation and no slash commands were ever registered.

This was introduced by #9102 while fixing #9101.

Per Discord's official application command naming spec (^[-_'\p{L}\p{N}\p{sc=Deva}\p{sc=Thai}]{1,32}$, Unicode letters/numbers plus -_'), Python's \w (Unicode-aware by default in Python 3) is a reasonable native-re approximation, so no further character-class changes are needed.

Modifications / 改动点

• astrbot/core/platform/sources/discord/discord_platform_adapter.py: fixed the double-escaped regex from r"^[-_'\\w]{1,32}$" to r"^[-_'\w]{1,32}$".

• 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

Verified locally against every command name from the issue's reproduction log (Chinese and English), plus edge cases (uppercase, empty string, >32 chars):

'今日小猪'                 lower_ok=True  regex_ok=True  overall_valid=True
'pjsk猜卡面'              lower_ok=True  regex_ok=True  overall_valid=True
'测试猜卡'                 lower_ok=True  regex_ok=True  overall_valid=True
'猜卡面帮助'                lower_ok=True  regex_ok=True  overall_valid=True
'猜卡面分数'                lower_ok=True  regex_ok=True  overall_valid=True
'猜卡面自定义名称'             lower_ok=True  regex_ok=True  overall_valid=True
'重置猜卡面次数'              lower_ok=True  regex_ok=True  overall_valid=True
'猜卡面排行榜'               lower_ok=True  regex_ok=True  overall_valid=True
'neko'                 lower_ok=True  regex_ok=True  overall_valid=True
'help'                 lower_ok=True  regex_ok=True  overall_valid=True
'sid'                  lower_ok=True  regex_ok=True  overall_valid=True
'name'                 lower_ok=True  regex_ok=True  overall_valid=True
'reset'                lower_ok=True  regex_ok=True  overall_valid=True
'stop'                 lower_ok=True  regex_ok=True  overall_valid=True
'new'                  lower_ok=True  regex_ok=True  overall_valid=True
'stats'                lower_ok=True  regex_ok=True  overall_valid=True
'provider'             lower_ok=True  regex_ok=True  overall_valid=True
'dashboard_update'     lower_ok=True  regex_ok=True  overall_valid=True
'set'                  lower_ok=True  regex_ok=True  overall_valid=True
'unset'                lower_ok=True  regex_ok=True  overall_valid=True
'Help'                 lower_ok=False regex_ok=True  overall_valid=False  (correctly rejected: mixed case)
''                     lower_ok=True  regex_ok=False overall_valid=False  (correctly rejected: empty)
'a' * 33               lower_ok=True  regex_ok=False overall_valid=False  (correctly rejected: too long)

ruff format --check and ruff check pass on the modified file.

---

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

Bug Fixes:

• Fix slash command name regex so valid command names are accepted and registered instead of being incorrectly rejected.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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