v0.3.0

Changelog

• Show running version on the dashboard footer by @LarsLaskowski in #46
• Package release as a single self-contained directory by @LarsLaskowski in #47
• Re-detect thermal zone and vcgencmd after startup by @LarsLaskowski in #48
• docs: add openHAB integration guide + Prometheus alternative by @LarsLaskowski in #49
• Add threshold-based alert engine (state + events) by @LarsLaskowski in #50
• Add HTTP webhook notifications for alert transitions (A3) by @LarsLaskowski in #51
• Harden pimonitor.service with additional systemd sandboxing by @LarsLaskowski in #52
• Add Pi throttling / undervoltage state (vcgencmd get_throttled) by @LarsLaskowski in #53
• Add metric detail modal with history range picker by @LarsLaskowski in #54
• Add per-core CPU frequency & governor (D5) by @LarsLaskowski in #55

Full Changelog: v0.2.0...v0.3.0