Upgrade dependencies and migrate console UI build to Vite

[ruibaby]

What this PR does

• Bump Halo platform to 2.26.0 (plugin now requires >= 2.26.0) and upgrade
  run.halo.plugin.devtools to 0.8.0
• Migrate packages/ui from Rsbuild to Vite via
  @halo-dev/ui-plugin-bundler-kit/vite; build output moves from
  src/main/resources/console to src/main/resources/ui
• Upgrade toolchain: Gradle 9.5.0, pnpm 11.22.0, Node 24 in the release
  workflow, Biome 2.5.9, Vite 8.2.2
• Upgrade frontend dependencies: tiptap 3.30, lit 3.3.3, unocss 66.8,
  shiki 4, @rslib/core 0.23, and switch iconify to per-collection packages
• Remove the stale packages/comment-widget/pnpm-lock.yaml (workspace root
  lockfile is the source of truth)

Notes

• uno.config.ts enables presetIcons({ warn: true }) to surface missing
  icons at build time
• Export reordering in index.ts / avatar-policy.ts is from the Biome
  upgrade's organizer, no behavior change