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/routes.ts

@@ -1679,11 +1679,11 @@ export async function registerRoutes(app: Express): Promise<Server> {
         return res.status(400).json({ error: "No logo file uploaded" });
       }
 
-      // Check if Cloudinary is configured globally
-      const cloudinaryConfig = await storage.getCloudinaryConfig();
+      // Get or auto-create config row (local storage doesn't need credentials)
+      let cloudinaryConfig = await storage.getCloudinaryConfig();
       if (!cloudinaryConfig) {
-        return res.status(400).json({
-          error: "Cloudinary not configured. Please configure Cloudinary first."
+        cloudinaryConfig = await storage.createCloudinaryConfig({
+          cloudName: 'local', apiKey: 'local', apiSecret: 'local',
         });
       }