Route IBKR live orders by account group

[Pigbibi]

Summary

• update QuantPlatformKit pin to the account-aware IBKR routing release
• pass account group UID into portfolio reads, pending/fill guards, and submitted IBKR orders
• fail fast when a runtime service tries to submit real orders for multiple account ids
• document one Cloud Run service per live IBKR UID

Tests

• PYTHONPATH=.:../QuantPlatformKit/src .venv/bin/ruff check --exclude external .
• PYTHONPATH=.:../QuantPlatformKit/src .venv/bin/python -m pytest -q tests/test_ibkr_order_execution.py tests/test_execution_service.py tests/test_runtime_config_support.py tests/test_runtime_composer.py

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Reject multi-account IDs only when submitting real orders

execute_rebalance now calls _resolve_order_account_id at function start, so any account_ids with more than one value raises ValueError even in dry_run_only=True runs or other early-exit paths where no order would be sent. That regresses dry-run/validation workflows for multi-account groups and does not match the stated behavior of failing when the service actually attempts real order routing; the check should be deferred to the non-dry-run submission path (or gated by a live-order mode flag).

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