Cherry-picked valuable changes from PR #206:
- hasReadImageProvider supports chain format {"providers":[...]} config
- create_image/video/audio verify file persistence after write with diagnostic logging
- HistoryEntry gains Media field + CollectMedia() for group media context on @mention
- Zalo extractContentAndMedia refactored: all media types via DetectMIMEType/BuildMediaTags, 20MB limit
- Discord/Zalo pass media paths to Record() and collect historical media on @mention
- Zalo send_helpers logs directory contents when checkFileSize stat fails
IsPaired() silently returned false on DB query failures (connection
timeout, pool exhaustion), causing the system to treat already-paired
users/groups as unpaired and create spurious pairing requests.
Changed IsPaired signature to return (bool, error). All 13 callers
across all channels (Telegram, Discord, Slack, Feishu, WhatsApp, Zalo)
and gateway (browser WS, pairing method) now fail-open on DB errors:
log a warning and assume paired, avoiding false rejections.
Pass contactCollector through channel manager to all channel handlers
(Telegram, Discord, Feishu, Slack, Zalo) so contacts are automatically
collected when users interact with the agent.
Extract shared media utilities (MediaInfo, BuildMediaTags, TranscribeAudio,
DetectMIMEType) into internal/channels/media/ and refactor Telegram to use
them. Add full inbound/outbound media support to Discord and Feishu channels
(STT transcription, document extraction, media tags, voice agent routing).
Add WebSocket media upload/serve endpoints and MIME-aware media tags in
chat.send. Split large channel files for maintainability.
viettranx