docs: update README for Last.fm, redesign, progress/retry, and pages

Bring the README current with everything shipped since it was written:
Last.fm as a second discovery source + the /lastfm browse page, the
/library grid, The Floor's three-phase progress + retry, and the
Pressing Plant design system. Add a "Running it" quick-start. Fix a
pre-existing inaccuracy: slskd is an external daemon reached via
config, not a compose service (stack is db + web + worker).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -4,8 +4,8 @@ Self-hosted, multi-source music acquisition and library tool — a replacement f
 Lidarr + NZBget. Lyra discovers, ranks, downloads, tags, and organizes music across
 sources of differing quality: **Qobuz** (lossless/hi-res), **Soulseek** (P2P), and
 **YouTube** (universal lossy fallback), with recommendation-driven discovery via
-**ListenBrainz** (Spotify's recommendation/related-artists APIs were retired for new
-apps, so discovery is MetaBrainz-native and MBID-clean — no Spotify).
+**ListenBrainz** and **Last.fm** (Spotify's recommendation/related-artists APIs were
+retired for new apps, so discovery is MetaBrainz-native and MBID-clean — no Spotify).
 
 ## Status
 
@@ -22,8 +22,10 @@ Built in three slices:
    existing on-disk albums as have + monitored + followed, and a per-artist
    studio-only / show-all release-type filter.
 3. **Discovery** — ✅ **done**. Recommendation-driven finding of new music via
-   **ListenBrainz** similar-artists (MBID-native), behind a pluggable
-   `SimilaritySource` interface. A background sweep (and a "Discover now" button)
+   **ListenBrainz** similar-artists and **Last.fm** `artist.getSimilar` (both
+   MBID-native), behind a pluggable `SimilaritySource` interface — Last.fm registers
+   as a second source automatically once its API key is set, and cross-source scores
+   are summed per candidate. A background sweep (and a "Discover now" button)
    aggregates artists similar to the ones you follow into a manual review feed of
    suggested **artists** and **albums** at `/discover`; **Follow** and **Want**
    reuse the slice-2 follow / wanted flows, **Dismiss** is permanent. Plus a
@@ -33,27 +35,62 @@ Built in three slices:
    Follow or Want before committing. No Spotify (its recommendation APIs are dead
    for new apps).
 
+Alongside the three slices:
+
+- **Last.fm browse** (`/lastfm`) — your Last.fm top artists and albums (by period),
+  with a "hide items already in my library" toggle; each artist opens a modal of your
+  most-played songs and albums, and every album is one click to **Want**.
+- **Library** (`/library`) — a cover-art grid of everything on disk, filterable, each
+  album opening a tracklist modal.
+- **The Floor** (home) — a live queue of in-flight acquisitions with three-phase
+  progress (**Searching → Downloading → Finishing**), a live download percentage, a
+  per-job "pressing ticket" (source · format · tracks · elapsed), and a **Retry**
+  button on anything that needs attention.
+
+The whole UI runs a hand-rolled "Pressing Plant" design system (warm-paper theme, self-hosted
+Fraunces serif for prose vs. system mono for machine data, light/dark aware).
+
 **Operational notes:** the monitor and the discovery sweep are both **off by
-default** — set `monitor.enabled=true` (+ optional `monitor.*` tuning) in the
-`Config` table to activate auto-grab/upgrade, and `discover.enabled=true` (or
+default** — set `monitor.enabled=true` (or Settings → Monitor, + optional `monitor.*`
+tuning) to activate auto-grab/upgrade, and `discover.enabled=true` (or
 Settings → Discovery, + optional `discover.*` tuning) to activate the scheduled
 discovery sweep. The `/discover` "Discover now" button and seed-search work with the
-sweep off. Credentials are entered in Settings and persist across
-`docker compose up -d --build` rebuilds (don't use `down -v`). Tests run against a
-separate `lyra_test` database (a guard blocks the live DB). Deferred hardening + the
-full roadmap live in the implementation-plan "Notes" sections under
+sweep off. Credentials (Qobuz, Soulseek, Last.fm) are entered in Settings and persist
+across `docker compose up -d --build` rebuilds (don't use `down -v`; secrets are
+encrypted at rest with `LYRA_SECRET_KEY`). Tests run against a separate `lyra_test`
+database (a guard blocks the live DB). Deferred hardening + the full roadmap live in
+the implementation-plan "Notes" sections under
 [`docs/superpowers/plans/`](docs/superpowers/plans/).
 
 ## Architecture
 
-Three Docker containers on a home server:
+The `docker compose` stack is three services on a home server:
 
-- **Next.js app** — UI + API (search, request, queue, progress, settings).
-- **Python worker** — all source integration (streamrip, yt-dlp, slskd client,
-  mutagen; MusicBrainz + ListenBrainz for metadata and discovery), running the
-  six-stage acquisition pipeline plus the background monitor and discovery sweeps.
-- **slskd** — off-the-shelf headless Soulseek daemon.
+- **db** — Postgres, the shared source of truth.
+- **web** — the Next.js app: UI + API (search, request, queue, progress, settings).
+- **worker** — the Python worker: all source integration (streamrip, yt-dlp, slskd
+  client, mutagen; MusicBrainz + ListenBrainz + Last.fm for metadata and discovery),
+  running the six-stage acquisition pipeline plus the background monitor and discovery
+  sweeps.
 
-**Postgres** is the shared source of truth; a shared `/music` volume is the library.
+Soulseek support talks to an **external slskd** daemon (an off-the-shelf headless
+Soulseek client) — the worker reaches it via the `slskd.url` + `slskd.api_key`
+credentials set in Settings, so run slskd separately rather than as part of this stack.
+
+A shared `/music` volume is the library, with a separate `/staging` volume for
+in-progress downloads (point `STAGING_DIR` at a fast local disk when `MUSIC_DIR` is a
+network share).
 
 See [`docs/superpowers/specs/`](docs/superpowers/specs/) for the full design.
+
+## Running it
+
+```sh
+cp .env.example .env          # then edit: set LYRA_SECRET_KEY (openssl rand -base64 32) and MUSIC_DIR
+docker compose up -d --build  # web on http://localhost:8770 ; NEVER `down -v` (wipes the Postgres volume)
+```
+
+The web entrypoint runs `prisma migrate deploy` on every rebuild, so schema changes
+reach the live DB automatically. Enter Qobuz / Soulseek / Last.fm credentials in
+**Settings** (they persist across rebuilds), then follow an artist or request an album
+to feed The Floor.