feat(preset): expand ${VAR} in channel config fields and MCP URLs#23
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Wrap bot_id, bot_secret, app_id, app_secret, corp_id, corp_secret,
agent_id, callback_token, callback_aes_key, encrypt_key, and MCP server
URLs with os.ExpandEnv at consumer sites. Preset struct holds ${VAR}
placeholders — no secrets in memory or logs.
Plain values pass through unchanged, fully backward compatible.
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Preset YAML channel secrets now support ${VAR} env var expansion via os.ExpandEnv at consumer sites.
Design: Expand at consumer sites (InitChannels + adapter constructors), not at LoadPreset. Preset struct holds ${VAR} placeholders — no secrets in
memory/logs.
Usage:
Plain values (no ${) pass through unchanged — fully backward compatible.