feat(gateway): add native Weixin/WeChat support via iLink Bot API
Add first-class Weixin platform adapter for personal WeChat accounts:
- Long-poll inbound delivery via iLink getupdates
- AES-128-ECB encrypted CDN media upload/download
- QR-code login flow for gateway setup wizard
- context_token persistence for reply continuity
- DM/group access policies with allowlists
- Native text, image, video, file, voice handling
- Markdown formatting with header rewriting and table-to-list conversion
- Block-aware message chunking (preserves fenced code blocks)
- Typing indicators via getconfig/sendtyping
- SSRF protection on remote media downloads
- Message deduplication with TTL
Integration across all gateway touchpoints:
- Platform enum, config, env overrides, connected platforms check
- Adapter creation in gateway runner
- Authorization maps (allowed users, allow all)
- Cron delivery routing
- send_message tool with native media support
- Toolset definition (hermes-weixin)
- Channel directory (session-based)
- Platform hint in prompt builder
- CLI status display
- hermes tools default toolset mapping
Co-authored-by: Zihan Huang <bravohenry@users.noreply.github.com>
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