Octopus saving join service, Bug fixes and minor improvements

What's Changed

Octopus and bottle cap dave fixes

• feat(octopus): Power Up/Power Down migration - join service and entity regex (points 2 & 3 of #4548) by @chalfontchubby in #4601

Small improvements

• fix(config): widen currency-scoped price ranges for non-GBP markets by @chalfontchubby in #4615
• fix(web): serve the Predbat logo locally instead of from GitHub by @chalfontchubby in #4568

Bug fixes

• fix(sunsynk,deye): own the power sign flags instead of inheriting them by @springfall2008 in #4618
• feat(plan): show the actual planned charge/export rate in the hover text by @chalfontchubby in #4608
• Split charge windows at dawn for any combine_charge_slots user, not just low power mode by @springfall2008 in #4604
• fix(ml): resolve NaN training loss on startup and preserve database zero entries by @rholligan in #4597
• fix(output): set device_class on 9 dashboard sensors missing it by @chalfontchubby in #4622
• fix(inverter): discharge_start_service sends the planned rate, not always max by @chalfontchubby in #4621
• fix(octopus): prune Intelligent devices Octopus no longer returns as live by @springfall2008 in #4625

Code cleanup

• refactor(export): name the export_limit freeze/idle sentinels by @chalfontchubby in #4606

New Contributors

• @rholligan made their first contribution in #4597

Full Changelog: v8.49.2...v8.50.0