feat: merge live model metadata

[ricatix]

Ringkasan

• normalisasi metadata model live 9router dengan batas trust dan fallback aman
• terapkan authority live-first, limits atomik, dan isolasi kegagalan per model
• perluas validasi catalog dan kontrak discovery/E2E

Verifikasi

• bun test tests/index.test.ts tests/model-mapper.test.ts tests/models-dev.test.ts tests/llm-catalog.test.ts tests/model-translation.e2e.test.ts
• bun run check
• bun run build
• git diff --check