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-logo-size.js

@@ -0,0 +1,11 @@
+// test/check-logo-size.js
+const axios = require('axios');
+
+async function main() {
+  const url = 'https://demoplace.my.id/nexus-logo.png';
+  const res = await axios.head(url);
+  console.log('Remote nexus-logo.png content-length:', res.headers['content-length']);
+  console.log('Remote nexus-logo.png content-type:', res.headers['content-type']);
+}
+
+main().catch(err => console.error(err.message));