v1.1.5 - Hub A1 endpoint diagnostics

Summary

• Add serial-safe app API payload summaries for direct app lookup and home-device fallback.
• Add serial-safe Hub A1 optional telemetry endpoint summaries and final built-state summaries.
• Bump the HACS manifest version to 1.1.5.

Test Plan

• python3 -m unittest -v tests/test_hub_a1.py tests/test_hacs_metadata.py tests/test_unify_response.py tests/test_bluetti_capture.py
• python3 -m py_compile custom_components/bluetti/hub_a1.py custom_components/bluetti/api/product_client.py custom_components/bluetti/init.py
• python3 -m json.tool custom_components/bluetti/manifest.json
• python3 -m json.tool hacs.json