docs: reflect Phase 22 SEO metadata component as landed

DeepDrftPublic.Client/CLAUDE.md

@@ -40,6 +40,7 @@ All interactive UI for the site. Blazor WebAssembly. Pages, controls, the stream
   - `AddToQueueButton.razor`: Append-only Add-to-Queue button shared across detail-page play sites (Phase 17 wave 17.4). Two modes: track mode (calls `IQueueService.Enqueue` with a single `TrackDto`) and release mode (calls `IQueueService.EnqueueRange` with an ordered track list). Material `PlaylistAdd` glyph; tooltip "Add to queue" (track mode) / "Add release to queue" (release mode). Reads the cascaded `IQueueService`; disabled until interactive or when the cascade is absent. Append-only — does not play, does not navigate. Placed at: `CutDetail` header (release mode, `TrackNumber`-ordered list), `CutDetail` track rows (track mode), `SessionDetail` hero play (track mode), `MixDetail` hero play (track mode). Excluded from `StreamNowButton` (OQ9) and `ReleaseGallery` cards (OQ10, deferred).
   - `ReleaseDetailScaffold.razor`: Shared scaffold for release detail pages. Gained an optional `Ambient` `RenderFragment` slot (Phase 12) — a full-bleed layer rendered behind the main content. Absent slot = no regression. Cut mounts `<WaveformVisualizer>` + `<WaveformVisualizerControlPopover>` here; Mix uses its own full-bleed mount outside the scaffold. The scaffold's default masthead PLAY (`PlayTrack`) routes through `IQueueService.PlayTrack` (deque PLAY semantics — prepends the track to the queue front) when the queue cascade is present, falling back to `IStreamingPlayerService.SelectTrackStreaming` when absent; toggle-pause is handled directly via `IStreamingPlayerService.TogglePlayPause` when this track is already active.
   - `SharePopover.razor`: Share affordance serving both track and release surfaces from one clipboard/popover-chrome source. **Track mode** (`EntryKey` set): copies the track's canonical URL and offers an iframe embed snippet pointing at `FramePlayer?TrackEntryKey=…`. **Release mode** (`ReleaseEntryKey` + `ReleaseMedium` set): copies the release's canonical detail URL (via `ReleaseRoutes.DetailHref`) and offers an iframe embed snippet pointing at `FramePlayer?ReleaseEntryKey=…`, which queues and auto-advances through the release's tracks on first play. Both modes offer the embed affordance — release mode no longer suppresses it. The iframe snippet is built by `EmbedSnippetBuilder`. A transient "Copied!" confirmation resets after a short delay.
+  - `SeoHead.razor`: Purely presentational SEO head emitter (Phase 22). Renders a `<PageTitle>` + `<HeadContent>` block from a single `SeoModel` parameter — standard meta (description, robots), canonical, Open Graph, Twitter Card, and schema.org JSON-LD. Owns no data fetch; each page wires it in one line and supplies the model from its already-bridged ViewModel state. Wired on Home, About, Cut/Session/Mix detail (incl. not-found branches → `noindex`), browse views, and the 404 page.
 - `Helpers/`: Utilities and mapper functions.
   - `PlaybackIcons.cs`: Static `Resolve(isPlaying, isPaused, trackId, currentTrackId)` method — the sole glyph-mapping source for transport icons across all surfaces. Returns `(Icon, IsActive, IsPaused)` tuple.
   - `RuntimeFormat.cs`: Static `ToHoursMinutes(double totalSeconds)` helper. Formats a seconds value as `h:mm` (hours not zero-padded, minutes always two digits). Negative / non-finite inputs return `"0:00"`. Used by `NowPlayingStats` for the mix runtime figure.
@@ -70,6 +71,11 @@ All interactive UI for the site. Blazor WebAssembly. Pages, controls, the stream
 - `Common/`: Shared utilities.
   - `DarkModeSettings.cs`: `[PersistentState]`-annotated class (single source of truth for dark mode in the client). Registered scoped.
   - `ReleaseRoutes.cs`: Static helper. `DetailHref(long id, ReleaseMedium)` returns the canonical public detail route for a release; consumed by Archive, AlbumsView, player bar, and TrackRedirect (11.B).
+  - `SeoModel.cs`: Typed per-page SEO input (Phase 22). Named factories: `ForRelease` (medium-dispatched — Cut → `MusicAlbum`, Session → `MusicAlbum`/`LiveAlbum`, Mix → `MusicRecording`), `ForHome`, `ForAbout`, `ForBrowse`, `ForNotFound`. Encodes the medium→schema.org mapping in one place. `SeoModel.Robots` overrides the environment-default (see `SeoEnvironment`).
+  - `SeoJsonLd.cs`: Typed schema.org JSON-LD builders (Phase 22). Types: `MusicGroup` (home/about, with `sameAs: ["https://instagram.com/deepdrft.music"]`), `MusicAlbum`/`LiveAlbum` (cuts/sessions, with ordered `MusicRecording` track list and per-release `byArtist`), `MusicRecording` (mixes, with ISO-8601 `duration`), `CollectionPage` (browse). All serialized output is inline-safe-escaped (`<`/`>`/`&` → `\uXXXX`) to prevent script-breakout from CMS-authored text.
+  - `SeoOptions.cs`: Site-wide SEO config (Phase 22). `BaseUrl` (`https://deepdrft.com`), title suffix (`Deep DRFT`, middot separator), default OG image seam (uses `ImageProxyController` route), IG handle in `sameAs`, no Twitter handle. Registered via the static `Startup` seam (both server and WASM `Program.cs`). `BaseUrl` is config, not `window.location` — no `window` at server prerender, and the origin cannot be derived reliably behind the nginx proxy.
+  - `SeoUrls.cs`: URL helpers for canonical and `og:image` construction from `SeoOptions.BaseUrl` (Phase 22).
+  - `SeoEnvironment.cs`: Scoped `[PersistentState]` bridge for the server environment flag (Phase 22). Seeded in `DeepDrftPublic/Components/App.razor` from `IWebHostEnvironment.IsProduction()` — mirrors the `DarkModeSettings` bridge pattern. Default robots is `index,follow` only in Production; `noindex,nofollow` in every non-production environment so the beta/staging site stays uncrawled. Explicit per-page `SeoModel.Robots` overrides this default. Fail-safe default is `noindex`.
 - `Program.cs`: WASM entry point. Calls `Startup.ConfigureApiHttpClient`, `ConfigureContentServices`, `ConfigureDomainServices`.
 - `_Imports.razor`: Global using statements and component imports.
 
@@ -129,6 +135,8 @@ New modules in `DeepDrftPublic/Interop/audio/`:
 
 The flow ensures the first paint uses the correct theme (no flash), and toggling the button persists the setting to a 365-day cookie.
 
+**`SeoEnvironment` follows the same `[PersistentState]` bridge pattern** (Phase 22). It is seeded server-side in `DeepDrftPublic/Components/App.razor` from `IWebHostEnvironment.IsProduction()` and bridged to the WASM client. Consumers (`SeoHead`) read `SeoEnvironment.IsProduction` to gate the default robots directive (`index,follow` in Production, `noindex,nofollow` elsewhere). The pattern is identical to `DarkModeSettings` — one server-side seed, one `PersistentComponentState` round-trip, one scoped client read.
+
 ## MVVM convention
 
 Component state lives in ViewModels (registered scoped in DI). Components render and dispatch only.