Add Firstrade Cloud Run deployment

[Pigbibi]

Summary

• add Cloud Build config and GitHub Actions deployment workflow for firstradequant Cloud Run
• allow Scheduler POST requests on /, /precheck, and /probe
• add gunicorn runtime config and request-route coverage

Validation

• python -m py_compile main.py
• gcloud builds submit deployed firstrade-quant-service successfully in firstradequant
• Cloud Scheduler manual probe run completed without error

Notes

• ENABLE_GITHUB_ENV_SYNC is currently false because Firstrade credential secret versions are not populated yet
• the main execution scheduler is created but paused until credentials and live/dry-run gates are explicitly enabled

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep NOTIFY_LANG optional in env-sync validation

This block adds NOTIFY_LANG to required_vars whenever it is unset, so any run with ENABLE_GITHUB_ENV_SYNC=true fails validation unless NOTIFY_LANG is explicitly provided. The runtime path already has a default (runtime_config_support.py uses os.getenv("NOTIFY_LANG", "en")), so this introduces a new deployment failure for previously valid configurations where language is intentionally omitted.

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