Add Cloud Run runtime guard alerts

[Pigbibi]

Summary

• add a Runtime Guard workflow that checks Cloud Scheduler and Cloud Run logs without invoking trading routes
• send Telegram alerts directly for Cloud Scheduler, Cloud Run, or optional missed-run heartbeat issues
• document setup and heartbeat behavior in English and Chinese

Validation

• python -m py_compile scripts/cloud_run_runtime_guard.py
• local dry run with scheduler check disabled
• real read-only Cloud Logging smoke with Telegram disabled
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Check heartbeat success per service

When RUNTIME_GUARD_REQUIRE_SUCCESS=true and RUNTIME_GUARD_CLOUD_RUN_SERVICES lists more than one service, this global success_count lets any one service's 2xx/3xx request suppress the missed-run alert for all the others. In that configuration, a scheduler failure or missed invocation for service B is not reported if service A had a recent successful request, so the heartbeat guard can miss exactly the per-service outage it is meant to catch.

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