Add player functionality with HLS support and API integration

- Implemented a new Player class in player.js to handle audio playback, including HLS support using hls.js.
- Created a shared API module in api.js for making HTTP requests with proper error handling.
- Added DOM utility functions in dom.js for creating and clearing elements.
- Introduced WebSocket connection handling in ws.js for real-time updates.
- Developed a comprehensive CSS stylesheet for styling the application, including a high-contrast theme.

server/scripts/restore-images-from-seed.js

@@ -0,0 +1,48 @@
+// Restore image_url from seed JSON files for any station where it is currently NULL.
+// Match priority: explicit uuid → uuidFromSlug(slug) → exact name.
+import 'dotenv/config';
+import Database from 'better-sqlite3';
+import { readFileSync, readdirSync } from 'node:fs';
+import { resolve, dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { createHash } from 'node:crypto';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const SEED_DIR = resolve(__dirname, '../../data/seed');
+
+function uuidFromSlug(slug) {
+    const h = createHash('sha1').update('oradio:' + slug).digest('hex');
+    return [h.slice(0, 8), h.slice(8, 12), '5' + h.slice(13, 16), '8' + h.slice(17, 20), h.slice(20, 32)].join('-');
+}
+
+const db = new Database(process.env.DB_PATH || './data/db/oradio.sqlite');
+const apply = process.argv.includes('--apply');
+
+const entries = [];
+for (const f of readdirSync(SEED_DIR).filter((x) => x.startsWith('stations') && x.endsWith('.json'))) {
+    try {
+        const data = JSON.parse(readFileSync(join(SEED_DIR, f), 'utf8'));
+        if (Array.isArray(data)) entries.push(...data);
+    } catch { }
+}
+
+const byUuid = new Map();
+const byName = new Map();
+for (const e of entries) {
+    if (!e.image_url) continue;
+    const u = e.uuid || (e.slug ? uuidFromSlug(e.slug) : null);
+    if (u) byUuid.set(u, e.image_url);
+    if (e.name) byName.set(e.name.toLowerCase(), e.image_url);
+}
+
+const rows = db.prepare(`SELECT id, uuid, name FROM stations WHERE image_url IS NULL OR image_url = ''`).all();
+const upd = db.prepare('UPDATE stations SET image_url = ? WHERE id = ?');
+let restored = 0;
+for (const r of rows) {
+    const url = (r.uuid && byUuid.get(r.uuid)) || byName.get(r.name?.toLowerCase());
+    if (!url) continue;
+    console.log(`restore ${r.name} -> ${url}`);
+    if (apply) upd.run(url, r.id);
+    restored++;
+}
+console.log(`Done. restored=${restored}${apply ? '' : ' (dry run; pass --apply to write)'}`);