feat(web): add public portfolio rendering and media streaming

docs/product-engineering/request-lifecycle-flows.md

@@ -71,3 +71,17 @@ Key files:
 - `apps/web/src/app/[locale]/commissions/page.tsx`
 - `packages/content/src/commissions.ts`
 - `packages/db/src/commissions.ts`
+
+## 7. Public Portfolio Rendering
+
+1. Visitor opens `/{locale}/portfolio` with optional group filter query.
+2. Public app loads published portfolio groups and filtered published artworks.
+3. Artwork cards render preferred rendition preview (`card` > `thumbnail` > `full`).
+4. Image bytes are streamed through web media endpoint using configured storage provider fallback.
+
+Key files:
+- `apps/web/src/app/[locale]/portfolio/page.tsx`
+- `apps/web/src/app/[locale]/portfolio/[slug]/page.tsx`
+- `apps/web/src/app/api/media/file/[id]/route.ts`
+- `apps/web/src/lib/media/storage-read.ts`
+- `packages/db/src/media-foundation.ts`