refactor(discover): read Release Watch from /discover/index response

The initial implementation added a dedicated get_release_watch client
method calling /albums/releaseWatch, but that path is only routed on
the mobile API; the web API (api.json/0.2) that qbz-qobuz speaks to
returned 'no Service found with those values'.

The correct source is already available: /discover/index — which we
were already calling for newReleases/pressAwards/qobuzissimes/etc —
also returns a release_watch container when the user has follows. We
were silently dropping it because DiscoverContainers didn't declare
the field.

Now:
- DiscoverContainers (Rust + TS mirror) declares the release_watch
  field with a serde alias that accepts both camelCase and snake_case
  spellings, so future naming churn upstream is tolerated
- HomeView reads it in fetchAllDiscoverData next to the other editorial
  sections (one less network round-trip)
- ForYouTab calls v2_get_discover_index and extracts only the
  release_watch container
- Reverted the custom /albums/releaseWatch endpoint, client method,
  core passthrough, bridge wrapper and v2_get_release_watch command

Section identity (homeSettingsStore id, i18n keys, render blocks)
is unchanged.

cc

crates/qbz-core/src/core.rs

@@ -760,22 +760,6 @@ impl<A: FrontendAdapter + Send + Sync + 'static> QbzCore<A> {
             .map_err(CoreError::Api)
     }
 
-    /// Get Release Watch — new releases from followed artists, labels and
-    /// awards (the "Radar de Novedades" feed in the Qobuz mobile client).
-    pub async fn get_release_watch(
-        &self,
-        limit: u32,
-        offset: u32,
-    ) -> Result<SearchResultsPage<Album>, CoreError> {
-        let client = self.client.read().await;
-        let client = client.as_ref().ok_or(CoreError::NotInitialized)?;
-
-        client
-            .get_release_watch(limit, offset)
-            .await
-            .map_err(CoreError::Api)
-    }
-
     /// Get artist page (full artist details with albums, tracks, similar)
     pub async fn get_artist_page(
         &self,