v2.0.0 - Combined Backend, Visual upgrades, Easy setup

What's Changed

• docs: restructure V2 roadmap around a unified HA Add-on by @rusty4444 in #50
• security(#2): first-run setup page by @rusty4444 in #42
• security(#1): move tokens out of HTML source by @rusty4444 in #41
• [addon-1] Unified Node 20 server: serves HTML + proxies HA/Plex by @rusty4444 in #52
• [addon-2] Home Assistant add-on wrapper (ingress, bashio, multi-arch) by @rusty4444 in #53
• [addon-3] CI: multi-arch build + GHCR publish for the HA add-on by @rusty4444 in #54
• [addon-4] Docker Compose example for HA Container users by @rusty4444 in #55
• feat(#47): Home Assistant Blueprint for tablet auto-switching by @rusty4444 in #51
• [addon-6] Built-in Fully Kiosk auto-switcher (alt to Blueprint) by @rusty4444 in #56
• [viz-1] Playback progress bar + visual toggle scaffolding by @rusty4444 in #57
• [viz-2] Ratings badges + info panel visibility mode by @rusty4444 in #58
• [viz-4] Genre chips on info panel by @rusty4444 in #59
• [viz-5] Backdrop art on pause (#21) by @rusty4444 in #60
• [viz-12] Burn-in mitigation (#28) by @rusty4444 in #61
• [viz-7] Theme presets + [viz-17] accent colour (#23, #66) by @rusty4444 in #69
• [viz-16] Frame style picker (#65) by @rusty4444 in #70
• [fn-6] Backend abstraction (#34) by @rusty4444 in #71
• [codex] Refresh dev README for V2 setup by @rusty4444 in #72
• [codex] Fix dev add-on image tag by @rusty4444 in #73
• [codex] Add setup Display tab for visual options by @rusty4444 in #74
• [codex] Fix blank Plex username playback detection by @rusty4444 in #75
• Release v2.0.0 by @rusty4444 in #76

Full Changelog: v1.1.1...v2.0.0