chore: initial commit — Radio v0.1.0 (Phase A complete)

First release of a-radio — a free, focused SomaFM player for the
WordPress admin. Extracted-and-rebuilt from RangerPlex's RadioPlayer
component, simplified along the way (no Node CORS proxy needed; the
browser plays SomaFM streams directly).

Phase A deliverables — all in this commit:

PLAYER SURFACES
- Dashboard widget on WP Admin → Dashboard (compact: play/pause +
  station select + volume).
- Dedicated admin page at WP Admin → Radio → My Radio (larger
  layout, station genre badge, volume %% display).
- Both surfaces share the same JS — picking a station on one mirrors
  to the other within the same admin session.

STATIONS
- 44 SomaFM stations grouped by 10 genres (Ambient / Electronic /
  Lounge / Rock / Metal / Jazz / World / Reggae / Holiday / Specials).
- Ported verbatim from RangerPlex's RadioPlayer.tsx.
- Default station: Groove Salad (most popular SomaFM channel, safe
  ambient/coding pick).

STATE
- Per-user state stored in user_meta under key `radio_state`:
  { station_id, volume, theme, last_played_at }.
- Settings page lets the user pick default station, default volume,
  theme (auto/light/dark), and hide the dashboard widget.
- AJAX endpoint `radio_save_state` persists changes without a page
  reload. Nonce-protected, capability-checked, only known keys
  accepted, station validated against the list, volume clamped to
  [0,1].

UPDATES
- Self-hosted updater wired to Gitea (ranger/a-radio) from commit 1.
- Direct port of Buddy's inc/updater.php with BUDDY_* → RADIO_* and
  buddy_* → radio_* renames. Same 12h-success / 1h-error caching.

ARCHITECTURE
- No `wp` prefix (trademark policy).
- GPL v2+ public Gitea repo from day one.
- Vanilla JS only — no React, no webpack, no minified-only files.
- CSS-only animations, all assets local.
- Single H1 per admin page.
- Direct HTML5 <audio> playback (SomaFM has CORS headers; no PHP
  audio proxy needed). This is the key simplification vs RangerPlex.

COMPLIANCE
- "Powered by SomaFM" credit displayed on both player surfaces with
  link to somafm.com. About page invites users to donate to SomaFM
  directly.

PHASE PROGRESSION (not in this commit)
- Phase B — Settings polish + retry on transient stream errors +
  README.md formatted for WP.org submission.
- Phase C — Now-playing metadata via SomaFM's per-station song
  history endpoint (this is where the RangerPlex proxy logic ports
  to — server-side, for metadata not audio).
- Phase D — [ranger_radio] shortcode for frontend embedding.
- Phase E — Favorites system.
- Phase F — Multi-provider (Radio Paradise / NTS / KEXP / BBC).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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