feat(source2): push all latest files - device labeling, help system, proxy docs, database isolation fix

- Added DOKUMENTASI-FILTER-PER-SITE.md (site isolation docs)
- Fixed start-with-env.js to force-load .env.production
- Fixed MONGODB_URI hostname from mongodb-netify to mongodb.prod.proit.id
- Updated .gitignore to exclude sensitive scripts and credential files
- Minor UI and labeling improvements

test/check-backend-model.js

@@ -0,0 +1,15 @@
+const mongoose = require('mongoose');
+const { LookupApp } = require('../backend/models/Schemas');
+
+async function main() {
+  const uri = 'mongodb://127.0.0.1:27017/backone_dpi';
+  await mongoose.connect(uri);
+  console.log('Connected to:', mongoose.connection.name);
+  
+  const count = await LookupApp.countDocuments({});
+  console.log('LookupApp model count in backend schema:', count);
+  
+  await mongoose.disconnect();
+}
+
+main().catch(console.error);