Replaces the NestJS mana-search service with a Go implementation for
lower resource usage and faster startup. All 7 API endpoints are 1:1
compatible (search, extract, bulk extract, engines, health, metrics,
cache clear). Uses go-readability for content extraction and
html-to-markdown for Markdown conversion. Redis cache with graceful
degradation, Prometheus metrics, and structured JSON logging.
Binary: 22 MB vs ~200+ MB node_modules.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
