plugins: add webamp, the first Teahub plugin

A Winamp-style player docked on every page, fed by gandora's playlist.json
(falls back to a demo track). Installed on prod under /data/gitea:
templates/custom/footer.tmpl (appended) and public/assets/plugins/webamp/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HLEj1MiGohaV4qJE4NE1Xq

plugins/README.md

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+# Teahub plugins
+
+Each folder is one plugin: a `plugin.json` manifest plus the files it drops into Gitea's custom dir (`$GITEA_CUSTOM`, `/data/gitea` on prod).
+
+- `slots` — templates appended into Gitea's custom template slots (e.g. `footer`).
+- `assets` — files served under `/assets/...`.
+- `config` — plugin settings.
+
+Install today is manual: back up the slot template, append the plugin's template, copy assets, restart Gitea. An install Action that reads the manifest is next.
+
+| Plugin | Status |
+|---|---|
+| webamp | live on prod |

plugins/webamp/plugin.json

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+{
+  "name": "webamp",
+  "title": "Webamp",
+  "version": "0.1.0",
+  "description": "A Winamp-style player on every Teahub page, fed by gandora.",
+  "slots": {
+    "footer": "templates/custom/footer.tmpl"
+  },
+  "assets": ["public/assets/plugins/webamp/webamp-mod.js"],
+  "config": {
+    "playlist_url": "https://gandora.yolopreneur.lol/playlist.json"
+  }
+}

plugins/webamp/public/assets/plugins/webamp/webamp-mod.js

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+// teahub plugin: webamp — a Winamp-style player docked on every Teahub page.
+// Loads Webamp from the CDN on first click, so pages stay fast for everyone else.
+
+// Module scripts have no document.currentScript, so find our tag by its data attribute.
+const script = document.querySelector('script[src*="plugins/webamp/webamp-mod.js"]');
+const PLAYLIST_URL = script?.dataset.playlist;
+const KEY = 'teahub-webamp-open';
+
+const FALLBACK = [
+  {
+    metaData: { artist: 'DJ Mike Llama', title: "Llama Whippin' Intro" },
+    url: 'https://cdn.jsdelivr.net/gh/captbaritone/webamp@43434d82/mp3/llama-2.91.mp3',
+    duration: 5.322286,
+  },
+];
+
+async function loadTracks() {
+  if (!PLAYLIST_URL) return FALLBACK;
+  try {
+    const res = await fetch(PLAYLIST_URL, { mode: 'cors' });
+    if (!res.ok) throw new Error(res.status);
+    const list = await res.json();
+    // gandora format: [{ title, artist, url, duration? }]
+    const tracks = list
+      .filter((t) => t && t.url)
+      .map((t) => ({
+        metaData: { artist: t.artist || 'gandora', title: t.title || 'untitled' },
+        url: t.url,
+        ...(t.duration ? { duration: t.duration } : {}),
+      }));
+    return tracks.length ? tracks : FALLBACK;
+  } catch {
+    return FALLBACK;
+  }
+}
+
+let webamp = null;
+
+async function open() {
+  if (webamp) return;
+  const { default: Webamp } = await import('https://unpkg.com/webamp@1.5.0/built/webamp.bundle.min.mjs');
+  if (!Webamp.browserIsSupported()) return;
+  webamp = new Webamp({ initialTracks: await loadTracks() });
+  webamp.onClose(() => {
+    webamp.dispose();
+    webamp = null;
+    try { localStorage.removeItem(KEY); } catch {}
+  });
+  await webamp.renderWhenReady(document.body.appendChild(document.createElement('div')));
+  try { localStorage.setItem(KEY, '1'); } catch {}
+}
+
+// Small launcher in the corner: the "sound system" button.
+const btn = document.createElement('button');
+btn.textContent = '▶ webamp';
+btn.title = 'Open Webamp';
+btn.style.cssText = [
+  'position:fixed', 'right:12px', 'bottom:12px', 'z-index:9999',
+  'font:12px/1 monospace', 'padding:6px 10px', 'border-radius:4px',
+  'border:1px solid #1d3', 'background:#000', 'color:#1d3', 'cursor:pointer',
+].join(';');
+btn.addEventListener('click', open);
+document.body.appendChild(btn);
+
+// Reopen if it was open on the last page.
+try { if (localStorage.getItem(KEY)) open(); } catch {}

plugins/webamp/templates/custom/footer.tmpl

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+{{/* teahub plugin: webamp */}}
+<script type="module" nonce="{{ctx.CspScriptNonce}}" src="{{AssetUrlPrefix}}/plugins/webamp/webamp-mod.js?v=010" data-playlist="https://gandora.yolopreneur.lol/playlist.json"></script>