Move frontend workspace into packages Gradle module

[ruibaby]

Summary

• Move the pnpm workspace and frontend tool configuration into packages/, and add it as a Gradle module.
• Build frontend assets in package-local output directories and include them in the plugin JAR through processResources.
• Update CI, npm release, and Husky paths for the new workspace root.

Validation

• ./gradlew clean build with Java 21
• pnpm install --frozen-lockfile from packages/
• pnpm -C comment-widget test from packages/ — 128 tests passed
• pnpm -C ui type-check from packages/
• pnpm -C widget exec node --test tests/content-hash.test.mjs from packages/
• pnpm exec biome check . from packages/ — 116 files checked
• Confirmed the JAR contains ui/main.*.js, static/comment-widget.js, and static/index.css
• Confirmed a subsequent :packages:pnpmBuild is up to date

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-24T15:24:38.968442Z	b01c3c3	New commits

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