Add DRM downloads, scrapers, gallery index, and UI improvements

- DRM video download pipeline with pywidevine subprocess for Widevine key acquisition
- Scraper system: forum threads, Coomer/Kemono API, and MediaLink (Fapello) scrapers
- SQLite-backed media index for instant gallery loads with startup scan
- Duplicate detection and gallery filtering/sorting
- HLS video component, log viewer, and scrape management UI
- Dockerfile updated for Python/pywidevine, docker-compose volume for CDM

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/index.js

@@ -11,6 +11,8 @@ import downloadRouter from './download.js';
 import galleryRouter from './gallery.js';
 import hlsRouter from './hls.js';
 import settingsRouter from './settings.js';
+import scrapeRouter from './scrape.js';
+import { scanMediaFiles } from './gallery.js';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
@@ -31,6 +33,7 @@ app.use(downloadRouter);
 app.use(galleryRouter);
 app.use(hlsRouter);
 app.use(settingsRouter);
+app.use(scrapeRouter);
 
 // Serve static client build in production
 const clientDist = join(__dirname, '..', 'client', 'dist');
@@ -59,6 +62,12 @@ async function start() {
 
   app.listen(PORT, () => {
     console.log(`[server] Listening on http://localhost:${PORT}`);
+    // Scan filesystem and populate media index in background
+    setImmediate(() => {
+      try { scanMediaFiles(); } catch (err) {
+        console.error('[server] Media scan failed:', err.message);
+      }
+    });
   });
 
   // Start HTTPS server for DRM/EME support (requires secure context)