Allow Feishu websocket keepalive timing to be configured via platform
extra config so disconnects can be detected faster in unstable networks.
New optional extra settings:
- ws_ping_interval
- ws_ping_timeout
These values are applied only when explicitly configured. Invalid values
fall back to the websocket library defaults by leaving the options unset.
This complements the reconnect timing settings added previously and helps
reduce total recovery time after network interruptions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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