Core MTProxy resilience improvements:
- Implement 45s negative DNS cache to prevent rapid retry storms on NXDOMAIN/timeout
- Detect and reject 0.0.0.0 (IPv4) and :: (IPv6) blocked zero addresses from DNS resolvers
- Add resetTransportSocketForOpenConnection() to safely tear down stale sockets before new connection
- Enhance secret domain sanitization with better error classification (control chars vs invalid domain)
- Add pre-handshake DNS preflight check via isHostResolveNegativeCached() JNI
Plugin system expansion:
- Add pre_request_hook for request modification before send
- Add on_send_message_hook for outgoing message interception
- Add on_update/on_updates_hook for incoming update inspection
- Add app lifecycle hooks (start/stop/pause/resume)
- Add menu item system for plugin UI integration
- Refactor extera_utils to package with DexMaker class-proxy stubs
Proxy UX improvements:
- Manual proxy list reordering (drag-and-drop, no auto-sort by ping)
- Add diagnostic strings for new DNS failure phases
- Proxy health store now treats invalid-secret domains as punitive failures requiring rotation
Audio & maintenance:
- Set voice recording bitrate to 16 kbps (explicit, not OPUS_BITRATE_MAX)
- Enable VBR and voice signal hint for better speech compression
- Fix DialogsActivity AppName to use local resources, bypassing cloud strings
- Add guards for DNS resolver fallback chain, voice bitrate, and main title brand
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