reconnect() previously slept 500ms then unconditionally set
SessionState::Active, faking a successful reconnection regardless of
whether any broker or infrastructure was actually reachable.
Now performs a DB health check (SELECT 1) after the sleep. If the
check fails, state is set to Disconnected and an error is returned.
Active is only set when the health check passes. The DB ping is the
best available liveness probe until a real FIX/cTrader session is
wired into SessionRecovery.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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