feat: Replace external storage with local file storage + auto cleanup

Media is now stored directly on the server disk (no external service).
Files are served via Express static middleware at /uploads/*.

Cleanup rules:
- Videos deleted immediately after successful publish to Facebook/Instagram
- Videos older than 7 days purged daily by cron job
- Images older than 30 days purged daily by cron job

Changes:
- server/services/minio.ts: replaced S3 client with local fs read/write
- server/index.ts: added static serving for /uploads/media, /logos, /stories
- server/services/media-purge.ts: new rules (images 30d, videos 7d)
- server/services/scheduler.ts: delete local videos after successful publish
- docker-compose.yml: add media_uploads, logos_uploads, stories_uploads volumes
- settings UI: removed credentials card, shows local storage info
- package.json: removed googleapis (unneeded)

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

server/index.ts

@@ -66,6 +66,17 @@ app.use('/api/auth/login', authLimiter);
 const AUDIO_UPLOAD_DIR = process.env.AUDIO_UPLOAD_DIR || '/app/uploads/audio';
 app.use('/uploads/audio', express.static(AUDIO_UPLOAD_DIR));
 
+// Serve locally stored media files (images, videos, logos, stories)
+const MEDIA_UPLOAD_DIR = path.join(process.cwd(), 'uploads', 'media');
+const LOGOS_UPLOAD_DIR = path.join(process.cwd(), 'uploads', 'logos');
+const STORIES_UPLOAD_DIR = path.join(process.cwd(), 'uploads', 'stories');
+try { fs.mkdirSync(MEDIA_UPLOAD_DIR, { recursive: true }); } catch { /* ignore */ }
+try { fs.mkdirSync(LOGOS_UPLOAD_DIR, { recursive: true }); } catch { /* ignore */ }
+try { fs.mkdirSync(STORIES_UPLOAD_DIR, { recursive: true }); } catch { /* ignore */ }
+app.use('/uploads/media', express.static(MEDIA_UPLOAD_DIR));
+app.use('/uploads/logos', express.static(LOGOS_UPLOAD_DIR));
+app.use('/uploads/stories', express.static(STORIES_UPLOAD_DIR));
+
 // Serve temp uploads for Remotion
 const TEMP_UPLOAD_DIR = process.env.TEMP_UPLOAD_DIR || path.join(process.cwd(), 'uploads', 'temp');
 try { fs.mkdirSync(TEMP_UPLOAD_DIR, { recursive: true }); } catch { /* ignore */ }