- Add Ping() method to Bridge interface for active connectivity testing
- Implement XMPP ping using disco#info query to server domain (fast & reliable)
- Implement Mattermost bridge ping using GetServerVersion API call
- Add comprehensive OnSharedChannelsPing hook with proper error handling
- Replace timeout-prone IQ ping with proven disco#info approach
- Add detailed logging for monitoring and debugging ping operations
- Fix doctor command to use new Ping method instead of TestConnection
- Performance: XMPP ping now completes in ~4ms vs previous 5s timeout
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Co-Authored-By: Claude <noreply@anthropic.com>