v0.9.15b1

This is a pre-release with improved energy data import from @jpm16930 built largely with Claude Code, and a code review by myself.

What's Changed

• Per hour statistics import by @jpm16930 in #445
• Restore heating_circuit_flow_setpoint attribute on CircuitStateSensor by @hugo-brito in #441

New Contributors

• @jpm16930 made their first contribution in #445

Full Changelog: v0.9.14...v0.9.15b1