* feat(channels): enhance QQ channel with group support, typing, media, and URL sanitization
Add group message routing alongside existing C2C (direct) support using
chatType sync.Map to track whether a chatID is group or direct. Implement
passive reply with msg_id/msg_seq tracking for multi-part responses.
Add StartTyping (InputNotify msg_type=6 with periodic resend), SendMedia
(RichMediaMessage for HTTP/HTTPS URLs), and configurable Markdown message
support. Replace unbounded dedup map with TTL-based expiry and janitor
goroutine.
Sanitize URLs in group messages by replacing dots in domains with fullwidth
period to avoid QQ's URL blacklist rejection (error 40054010). Add rate
limit config (5 msg/s) and MaxMessageLength/SendMarkdown config fields.
* fix(channels): address review feedback on QQ channel implementation
- Fix goroutine leak: reinitialize done channel and sync.Once in Start()
to prevent multiple janitor goroutines on restart
- Fix double-close panic: guard close(done) with sync.Once in Stop()
- Fix StartTyping context: use c.ctx (channel lifecycle) instead of
caller's ctx (request lifecycle) for typing goroutine
- Refactor: extract getChatKind() helper to deduplicate chatType lookup
across Send(), StartTyping(), and SendMedia()
- Fix: use new(atomic.Uint64) instead of taking address of local var
- Fix: require explicit http(s):// scheme in URL regex to avoid false
positives on version strings like "1.2.3"
- Optimize: collect expired keys before deleting in dedupJanitor to
reduce lock hold time
- Fix: remove MaxMessageLength zero-value override in NewQQChannel
since defaults.go already sets 2000
* fix(channels): address second round of review feedback on QQ channel
- Fix SendMedia: bypass media store for direct http(s) URLs in part.Ref;
only fall back to store.Resolve for media:// refs; log clear warning
for local-only paths instead of silently skipping
- Fix chatType routing: default unknown chatIDs to "group" (safer for QQ
since outbound-only destinations like reasoning_channel_id are groups);
pre-register reasoning_channel_id as group at Start() time; add debug
log for untracked chatIDs
- Add dedup hard cap (10000 entries): evict oldest entry when map
exceeds capacity to prevent unbounded memory growth under high traffic
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