Remove Tags feature from frontend, keep backend Tag API intact

[evertonschuster]

Summary

Split out of #69 (part 4 of 4 — the final piece; see that PR for the full picture). Stacked on #72 (Catalog Result migration + physical reorg) — this PR's base is #72's branch, so the diff shown here is only what this PR adds.

Removes the entire Tags vertical from apps/admin-frontend (domain, application, infrastructure, presentation, MSW handlers, E2E specs, nav entry, route, and catalog facade wiring) while intentionally retaining the backend Tag domain entity and /api/v1/tags endpoints, including Service's many-to-many relationship to Tag — a project-owner decision, see docs/adr/016-remove-tags-frontend.md. Categories replaces Tags as the reference CRUD implementation throughout the docs and the agenza-frontend-feature skill.

This is the same content as the standalone Tags-removal work already verified earlier this session against the full 246-file branch tip — reapplied here on top of the split stack (#70/#71/#72) instead of as one monolithic PR.

Test plan

• npm install + npm run build --workspace=apps/admin-frontend — green
• npm run lint --workspace=apps/admin-frontend — clean, 0 warnings
• npm run format:check --workspace=apps/admin-frontend — clean
• npm run test --workspace=apps/admin-frontend — 305/305 passing
• scripts/sync_agent_skills.py --check, scripts/check_agent_governance.py, scripts/architecture_guard.py — all pass

🤖 Generated with Claude Code

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[evertonschuster]

Fechando em favor de uma nova PR — essa estava baseada na branch antiga da #72 (não mergeada, substituída pela #75). Vou recriar com o mesmo conteúdo a partir do main atualizado.

[evertonschuster]

Recriada como #76 a partir do main atualizado (agora com #70/#71/#75 mergeadas) — mesmo conteúdo, sem mudança funcional.