chore: merge console repository into monorepo

[r2dedios]

Summary

Merges the cluster-iq-console repository into this repo under console/, creating a unified monorepo for all ClusterIQ components (API, Scanner, Agent, Console, Database).

Motivation: Both repos share the same release cycle, versioning, and CI pipeline. Maintaining them separately created double bureaucracy (PRs, CI, changelogs, releases) with no real benefit.

Changes

Repository structure

• Console source merged via git subtree into console/
• Removed console-level repo artifacts: .github/, .husky/, .gitignore, compose files
• Moved .editorconfig to root (covers both Go and TypeScript)
• Added .nvmrc (Node 18) for version pinning

Makefile unification

• Root Makefile now includes console-* targets that delegate to console/Makefile
• build aggregate target includes build-console
• clean target covers all images including console
• Console Makefile stripped down to npm/TypeScript-only targets

CI unification

• validate-pr.yaml: added console-lint job (prettier + eslint + tsc) in parallel with Go linting
• build-container-images.yaml: added console image build job alongside api/agent/scanner
• Deleted console/.github/workflows/ (superseded by root workflows)

Compose integration

• Added console service to root deployments/compose/compose-devel.yaml (port 8080)
• Deleted console/deployments/compose/ (superseded)

Documentation

• Root README.md: replaced external console link with monorepo Console section
• CLAUDE.md: added console to architecture, repo structure, and essential commands
• doc/developers/development-setup.md: rewritten for single-repo workflow
• doc/developers/publish-new-release-checklist.md: added console lint and version steps
• console/README.md: added monorepo note, updated quick-start

Cleanup

• console/package.json: removed husky/lint-staged, aligned version to 0.5.0
• console/package-lock.json: regenerated
• console/src/app/constants.ts: updated REPOSITORY_URL to monorepo

Test plan

• make console-lint passes (prettier + eslint + tsc)
• make help shows all console-* targets
• CI Console Lint job passes
• CI Go Linter job passes
• CI unit tests pass
• CI integration tests pass
• make build-console builds container image successfully
• make start-dev starts all services including console on port 8080