Add LongBridge SOXL plugin support

[Pigbibi]

Summary

• update QuantPlatformKit and UsEquityStrategies pins to the merged SOXX 20d volatility gate versions
• add LongBridge strategy plugin mount support and render plugin signals in existing Telegram messages
• sync LONGBRIDGE_STRATEGY_PLUGIN_MOUNTS_JSON through the Cloud Run env workflow

Architecture

• platform code passes runtime inputs/plugin signals and notifications only
• SOXL allocation and volatility gate logic remains in UsEquityStrategies; shared indicator construction remains in QuantPlatformKit

Tests

• .venv/bin/python -m pytest tests/test_runtime_strategy_adapters.py tests/test_runtime_composer.py tests/test_runtime_config_support.py::RuntimeConfigSupportTests::test_load_platform_runtime_settings_uses_defaults_with_explicit_strategy_profile tests/test_runtime_config_support.py::RuntimeConfigSupportTests::test_strategy_plugin_mounts_are_loaded_from_env tests/test_notifications.py::NotificationTests::test_build_translator_supports_chinese tests/test_request_handling.py -q
• bash tests/test_sync_cloud_run_env_workflow.sh
• .venv/bin/python -m ruff check application/runtime_strategy_adapters.py application/runtime_composer.py application/rebalance_service.py notifications/renderers.py notifications/telegram.py main.py runtime_config_support.py tests/test_runtime_strategy_adapters.py tests/test_notifications.py tests/test_runtime_config_support.py