feat: Expanded WeCom message parsing to capture msgtype, inline voice/video… (#1843)

* Expanded WeCom message parsing to capture msgtype, inline voice/video/file/link data, bounded base64 downloads, and richer mixed-message attachments (src/langbot/libs/wecom_ai_bot_api/api.py); added event accessors for new fields (src/langbot/libs/wecom_ai_bot_api/wecombotevent.py).
Converter now maps richer WeCom payloads (text, images, files, voice, video, links) into platform message chain with fallbacks when nothing parsable is present (src/langbot/pkg/platform/sources/wecombot.py).
Preprocessor now turns voice inputs into file URLs for downstream runners (src/langbot/pkg/pipeline/preproc/preproc.py).
Dify runner uploads all incoming files (images/audio/video/docs) after downloading or decoding data URLs, infers MIME types, and passes typed file descriptors into chat/workflow calls (src/langbot/pkg/provider/runners/difysvapi.py).

* Update src/langbot/pkg/platform/sources/wecombot.py

Fixed the issue of duplicate text in the comments.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/langbot/libs/wecom_ai_bot_api/api.py

Modify the way you approach challenges.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/langbot/pkg/platform/sources/wecombot.py

Changing the variable names makes more sense.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* feat: use from_base64 for the voice file converting

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Co-authored-by: tabriswang <tabriswang@finecomn.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Junyan Qin <rockchinq@gmail.com>

pyproject.toml

@@ -63,7 +63,7 @@ dependencies = [
     "langchain-text-splitters>=0.0.1",
     "chromadb>=0.4.24",
     "qdrant-client (>=1.15.1,<2.0.0)",
-    "langbot-plugin==0.2.0",
+    "langbot-plugin==0.2.1b1",
     "asyncpg>=0.30.0",
     "line-bot-sdk>=3.19.0",
     "tboxsdk>=0.0.10",