Support incremental UI and Java module setup

[ruibaby]

What changed

• add add ui support for incrementally adding a Vite or Rsbuild UI to an existing backend-only plugin
• add add module support for creating publishable Java library modules with Maven Central metadata and a publishing workflow
• introduce a shared plan-and-apply flow with conflict detection, idempotency, stale-plan protection, and rollback
• update Gradle files semantically without relying on generator marker comments
• centralize the default Halo and Maven publishing plugin versions
• add automated coverage for creation, incremental updates, conflicts, rollback, version inheritance, and repeated commands
• document the incremental commands and publishing requirements

Validation

• pnpm test — 18 tests passed
• pnpm exec biome check ./src ./test
• git diff --check
• packed the current CLI as an npm tarball and executed it through pnpm dlx
• generated and built fresh backend-only, Vite, Rsbuild, and multi-module plugin projects with Gradle 9.4
• verified adding UI to an existing backend-only project and repeating the command as a no-op
• verified incomplete commands and conflicting publish workflows fail without modifying the project
• verified Vite and Rsbuild linting, formatting, type checking, UI manifests, and packaged JAR resources
• verified Java module classes are included in the plugin JAR
• generated and inspected Maven POM files for two modules
• verified Maven Central release and snapshot task graphs with --dry-run
• ran pnpm audit --audit-level=high for both generated UI variants with no known vulnerabilities

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T14:29:10.217982Z	69fa585	New commits

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[chatgpt-codex-connector]

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Reviewed commit: 69fa58532f

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