fix: send color_temp_kelvin instead of removed kelvin key

[zoe-codez]

📬 Changes

Home Assistant removed the kelvin parameter from light.turn_on / light.toggle (it now rejects it: extra keys not allowed @ data['kelvin']). Send color_temp_kelvin instead, in the two places the library calls light.turn_on:

• light-manager.service.mts — the circadian color-temperature loop
• room.service.mts — scene apply

Also brings the toolchain current (needed to build against the updated dev-types):

• Bump all deps to latest; requires @digital-alchemy/hass@^26.6.13 (dev-types now expose color_temp_kelvin: number)
• Migrate ESLint config to v10 flat-config (jsonc → native flat config; wrap sort-keys-fix via @eslint/compat)
• tsconfig: add types: ["node"] (TS 6 / @types/node 25 no longer auto-include node globals)
• Replace upgrade script with the ncu --upgrade form

🗒️ Checklist

• Read the contribution guide and accept the
  code of conduct
• Readme and docs (updated or not needed)
• Tests (added, updated or not needed)