Show plugin load errors in strategy notifications

[Pigbibi]

Summary

• include strategy plugin load failures in cycle notifications
• append localized fallback lines alongside normal plugin signal lines
• bump QuantPlatformKit to 1a31ddde0dde0f2ad423e841a84af3ba0869e612

Tests

• PYTHONPATH=/home/ubuntu/Projects/QuantPlatformKit/src pytest -q tests/test_runtime_composer.py
• python -m compileall -q application/runtime_strategy_adapters.py application/runtime_composer.py main.py

Note: broader local pytest collection is blocked on this VPS by missing pandas.