Support per-account IBKR gateway ports

[Pigbibi]

Summary

• Add optional ib_gateway_port to IBKR account group runtime settings so multiple Gateway sessions can share one VM on different host ports.
• Keep strategy plugin summaries out of regular heartbeat/trade notifications; plugin alerts remain standalone.
• Update rollout docs and account-group example.

Validation

• PYTHONPATH=.:/home/ubuntu/Projects/QuantPlatformKit/src:/home/ubuntu/Projects/UsEquityStrategies/src timeout 180 .venv/bin/python -m pytest tests/test_runtime_config_support.py tests/test_event_loop.py::test_account_group_can_override_ib_gateway_port tests/test_event_loop.py::test_ib_gateway_mode_derives_paper_port tests/test_account_group_examples.py tests/test_strategy_runtime.py tests/test_request_handling.py::test_build_extra_notification_lines_includes_account_id tests/test_request_handling.py::test_handle_request_sends_escalated_strategy_plugin_alert -q
• timeout 120 .venv/bin/python -m ruff check README.md docs/examples/ibkr-account-groups.paper.json docs/ibkr_runtime_rollout.md main.py runtime_config_support.py tests/test_account_group_examples.py tests/test_event_loop.py tests/test_request_handling.py tests/test_runtime_config_support.py tests/test_strategy_runtime.py

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Stop using legacy env as implicit port override

When ib_gateway_port is omitted from the selected account group, this path now pulls IB_GATEWAY_PORT from the process env before applying the live/paper defaults. In deployments that still carry a legacy IB_GATEWAY_PORT, that stale global value silently overrides group behavior and can route a paper account group to the live gateway port (or vice versa), which undermines the per-account-port rollout and can direct orders to the wrong Gateway session.

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