fix: treat Discord voice attachments as records

[p1930n]

Fixes #7580.

Modifications / 改动点

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

This PR fixes Discord voice-message handling by mapping audio attachments to Record instead of generic File components. The adapter now detects audio attachments by normalized audio/* content type, with a filename-extension fallback for Discord attachments that do not expose a content type.

It also keeps the outgoing path compatible with the new component type by allowing DiscordPlatformEvent._parse_to_discord() to send Record components as Discord files. Image attachments still map to Image, and non-audio non-image attachments still map to File.

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

• Runtime verification with the Discord adapter enabled on astrbot:issue-7580-local:
  • Sending a Discord voice message logs [ComponentType.Record].
• docker run --rm -v "D:\AstrBot - PRs\AstrBot_issue_7580:/workspace" -w /workspace astrbot:issue-7580-local sh -lc "python -m pip install -q pytest pytest-asyncio && python -m pytest tests/test_discord_adapter.py tests/test_mattermost_adapter.py tests/test_telegram_adapter.py -q"
  • 17 passed, 1 warning
• docker run --rm -v "D:\AstrBot - PRs\AstrBot_issue_7580:/workspace" -w /workspace astrbot:issue-7580-local sh -lc "python -m pip install -q ruff && ruff check astrbot/core/platform/sources/discord/discord_platform_adapter.py astrbot/core/platform/sources/discord/discord_platform_event.py tests/test_discord_adapter.py && ruff format --check astrbot/core/platform/sources/discord/discord_platform_adapter.py astrbot/core/platform/sources/discord/discord_platform_event.py tests/test_discord_adapter.py"
  • All checks passed!
  • 3 files already formatted

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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 runtime results have been provided above. / 我的更改经过了良好的测试，并已在上方提供验证步骤和运行结果。
• 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

Handle Discord voice attachments as audio records instead of generic files while preserving compatibility with outbound Discord messages.

New Features:

• Map Discord audio attachments to Record components using content type and filename extension detection.

Bug Fixes:

• Correctly classify Discord voice-message attachments so they are treated as audio records rather than generic files.

Enhancements:

• Preserve original URLs when converting Discord audio attachments into Record components.
• Allow outgoing Record components to be sent to Discord as file uploads with appropriate filenames.

Tests:

• Add unit tests covering Discord attachment type mapping, URL preservation for audio records, and sending Record components as Discord files.

[gemini-code-assist]

Code Review

This pull request adds support for audio attachments in the Discord platform adapter by mapping them to the Record component and provides unit tests for this functionality. The review feedback identifies a potential regression in message sending because the Record component is not handled by the platform's message parser. Additionally, optimizations were suggested to pass the already computed content type to the audio detection logic to avoid redundant processing.

[p1930n]

Fixed in abf78b4.

Addressed all three review points:

1. Added Record support in DiscordPlatformEvent._parse_to_discord(), so Discord audio components are not dropped when re-sent in bridge/echo-style flows.
2. Added a unit test covering Record -> discord.File parsing.
3. Updated _is_audio_attachment() to reuse the already computed content_type, and updated the call site accordingly.

[sourcery-ai]

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

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[p1930n]

Fixed in abf78b4.

Record is now handled in DiscordPlatformEvent._parse_to_discord(), with unit test coverage. _is_audio_attachment() also reuses the computed content_type as suggested