feat: Add MinIO endpoint/public URL configuration via settings UI

Store endpointUrl and publicUrl in cloudinary_config DB table so
MinIO connection can be fully configured from the app settings
without needing environment variables.

- DB migration: adds endpoint_url and public_url columns
- Schema: adds endpointUrl/publicUrl to cloudinaryConfig table
- MinIO service: reads endpoint from DB (falls back to MINIO_ENDPOINT env)
- buildMinioUrl: accepts optional publicUrl override from DB config
- All routes updated to pass config.publicUrl to buildMinioUrl
- Settings UI (desktop + mobile): adds Endpoint URL and Public URL fields

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

server/routes/remotion.ts

@@ -128,7 +128,7 @@ remotionRouter.post("/render", upload.fields([{ name: "images", maxCount: 4 }, {
     try {
       const cloudinaryConfig = await dbStorage.getCloudinaryConfig();
       if (cloudinaryConfig?.cloudName && cloudinaryConfig?.logoPublicId) {
-        logoUrl = buildMinioUrl(cloudinaryConfig.cloudName, cloudinaryConfig.logoPublicId);
+        logoUrl = buildMinioUrl(cloudinaryConfig.cloudName, cloudinaryConfig.logoPublicId, cloudinaryConfig.publicUrl);
         console.log("🏢 Logo URL:", logoUrl);
       }
     } catch (e) {